1. From the Neurological Institute (M.M.S., T.R., R.G., X.C., R.L.S.) and the Division of Cardiology, Department of Medicine (M.R. Di T., C.L., S.H.), Columbia-Presbyterian Medical Center, New York, NY; Division of Biostatistics (X.C.) and Division of Epidemiology and Gertrude H. Sergievsky Center (R.L.S.), School of Public Health, Columbia University, New York, NY; and Center for Postgraduate Studies in Neuroscience, Danube University, Landesnervenklinik Gugging (M.M.S., M.B.), Gugging, Austria.