1. From the Departments of Epidemiology (H.H.H.A., B.F.J.V., D.B., M.W.V., M.A.I.) and Radiology (B.F.J.V., D.B., A.v.d.L., M.W.V., M.A.I.), Erasmus MC, Rotterdam, the Netherlands; and Departments of Neurology (M.C., C.E., R.S.) and Radiology (C.E.), Medical University of Graz, Graz, Austria.