Usefulness of Two-Dimensional and Speckle Tracking Echocardiography In “Gray Zone” Left Ventricular Hypertrophy to Differentiate Professional Football Player's Heart from Hypertrophic Cardiomyopathy - Kansal, Mayank M.; Lester, Steven J.; Surapaneni, Phani; Sengupta, Partho P.; Appleton, Christopher P.; Ommen, Steven R.; Ressler, Steven W.; Hurst, R. Todd (American Journal of Cardiology, 2011)