Outdoor Air Pollution, Preterm Birth, and Low Birth Weight: Analysis of the World Health Organization Global Survey on Maternal and Perinatal Health. - Fleischer, Nancy L.; Merialdi, Mario; Donkelaar, Aaron van; Vadillo-Ortega, Felipe; Martin, Randall V.; Betran, Ana Pilar; Souza, Joao Paulo; O'Neill, Marie S. (Environmental Health Perspectives, 2014)