1. From the Department of Epidemiology (M.L.P.P., F.J.W., A.H., M.K.I., M.A.I.), Neurology (M.L.P.P., F.J.W., P.J.K., M.A.I.), and Radiology (M.A.I.), Erasmus University Medical Center, Rotterdam, The Netherlands; and Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA (A.H.).