1. From the Department of Neurology (K.J.S., M.K.-H., A.B., C.S.K., P.A.W.), Framingham Heart Study, Boston University School of Medicine; the Department of Biostatistics (A.B., A.-H.N.), School of Public Health, Boston University, and the Department of Psychiatry (S.M.B.), Graduate Medical Sciences, Boston University School of Medicine, Boston, Mass.