1. From the Division of Epidemiology, Department of Medicine (E.A.A., E.K.K., W.J.B., L.L.), Department of Biostatistics (F.E.H.), Department of Medicine, Division of Cardiovascular Medicine, Vanderbilt Heart and Vascular Institute (J.M.B., T.J.W., D.K.G.), and Vanderbilt Translational and Clinical Cardiovascular Research Center (V-TRACC) (E.A.A., E.K.K., F.E.H., J.M.B., T.J.W., D.K.G., L.L.), Vanderbilt University School of Medicine, Nashville, TN.