1. From the Department of Neurology (M.S.D., B.B.-A., M.S.V.E.), College of Physicians and Surgeons, Columbia University, New York, NY; the Departments of Biostatistics (Y.P.M., M.C.P.) and Sociomedical Sciences (B.B.-A.), Mailman School of Public Health, Columbia University, New York, NY; and the Departments of Neurology (T.R., R.L.S.) and Epidemiology and Human Genetics (R.L.S.), Miller School of Medicine, University of Miami, Miami, Fla.