1. From the Cardiology Division, Department of Medicine (S.I., C.R., J.E.S., S.H., M.R.D.T.), and Departments of Biostatistics (Z.J.) and Neurology (M.S.V.E.), Columbia University, New York, NY; Department of Psychiatry and Behavioral Sciences, Stony Brook University, Stony Brook, NY (J.E.S.); and Departments of Neurology (T.R., R.L.S.) and Epidemiology and Human Genetics (R.L.S.), University of Miami, Miami, FL.