1. From the Alzheimer Center and Department of Neurology (J.D.C.G., W.M.v.d.F., P.S.), Department of Epidemiology and Biostatistics (W.M.v.d.F., D.L.K.), Department of Physics and Medical Technology (P.J.W.P.), and Department of Radiology (F.B., M.P.W.), Vrije Universiteit University Medical Center, Amsterdam, the Netherlands.