1. From the Radboud University Nijmegen Medical Centre, Donders Institute for Brain, Cognition and Behaviour, Center for Neuroscience, Department of Neurology (P.S., N.A.M.M., E.J.V.D., L.C.A.R-J., R.M.A., H.C.S., F-E.dL.), and Departments of Medical Psychology and Geriatric Medicine (R.P.C.K.), Nijmegen, The Netherlands; Department of Neurology, Medisch Spectrum Twente, Enschede, the Netherlands.(L.D.A.D.).