1. From the Departments of Epidemiology (O.L.R.O., F.Z., M.K.I., M.W.V., O.H.F., D.B., M.K.), Cardiology (L.R.B., S.R., K.E.G., J.W.D., J.W.R.H.), Radiology and Nuclear Medicine (R.P.J.B., M.W.V., A.v.d.L., D.B.), and Neurology (M.K.I.), Erasmus MC, University Medical Center Rotterdam, PO Box 2040, 3000 CA Rotterdam, the Netherlands.