| Authors: |
Martin SL; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Leach JM; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Sinkey R; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Boggess K; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Dugoff L; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Sibai B; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Hughes BL; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Bell J; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Aagaard K; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Edwards R; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Gibson KS; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Haas DM; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Plante L; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Metz TD; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Casey BM; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Longo S; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Saade GR; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Hoppe K; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Tuuli MG; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Owens MY; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Frey HA; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Rosen T; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Palatnik A; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Su EJ; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Krishna I; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Skupski D; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., El-Sayed YY; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Pereira L; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Magaan EF; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Habli M; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Williams S; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Pridjan G; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Parrish M; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Chang E; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Quinones J; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Kuo HC; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Szychowski JM; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina., Tita ATN; Department of Obstetrics and Gynecology, the Center for Women's Reproductive Health, and the Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; the Department of Obstetrics and Gynecology, University of North Carolina Chapel Hill, Chapel Hill, and the Department of Obstetrics and Gynecology, Duke University, Durham, North Carolina; the Department of Obstetrics and Gynecology, University of Pennsylvania, Philadelphia, the Department of Obstetrics and Gynecology, St. Luke's University Health Network, Bethlehem, the Department of Obstetrics and Gynecology, Drexel University College of Medicine, Philadelphia, and the Department of Obstetrics and Gynecology, Lehigh Valley Health Network, Allentown, Pennsylvania; the Department of Obstetrics and Gynecology, University of Texas at Houston, and the Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, the Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, and the Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas; HCA Healthcare and HCA Research Institute, Nashville, Tennessee; Maternal Fetal Care Center, Division of Fetal Medicine & Surgery, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts; the Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; the Department of Obstetrics and Gynecology, MetroHealth/Case Western University, Cleveland, the Department of Obstetrics and Gynecology, The Ohio State University, Columbus, and the Division of Maternal-Fetal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; the Department of Obstetrics and Gynecology, Indiana University, Indianapolis, Indiana; the Department of Obstetrics and Gynecology, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Ochsner Health, and the Department of Obstetrics & Gynecology, Tulane University, New Orleans, Louisiana; the Department of Obstetrics and Gynecology, University of Wisconsin-Madison, and the Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, Wisconsin; the Department of Obstetrics and Gynecology, Washington University in St. Louis, St. Louis, Missouri; the Department of Obstetrics and Gynecology, University of Mississippi Medical Center, Jackson, Mississippi; the Department of Obstetrics and Gynecology, Robert Wood Johnson Medical School, Rutgers University, Brunswick, and the Department of Obstetrics, Gynecology and Reproductive Health, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey; the Department of Obstetrics and Gynecology, University of Colorado, Aurora, Colorado; the Department of Obstetrics and Gynecology, Emory University, Atlanta, Georgia; the Department of Obstetrics and Gynecology, NewYork Presbyterian-Queens Hospital, Flushing, New York; the Department of Obstetrics and Gynecology, Stanford University, Stanford, California; the Oregon Health & Science University, Portland, Oregon; the Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; the Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, Kansas; and the Department of Obstetrics and Gynecology, Medical University of South Carolina, Charleston, South Carolina. |
