1. From the Cardiology Division, Hunter Holmes McGuire VA Medical Center, Richmond, VA (J.P., K.K., A.Y.T., J.F.H.); Cardiology Division/Pauley Heart Center, Virginia Commonwealth University, Richmond (J.P., K.K., A.Y.T., K.A.E., J.F.H.); School of Biostatistics, Virginia Commonwealth University, Richmond (A.P.S.); and Cardiology Division, University of Pittsburgh Medical Center, PA (J.G. III).