1. From the Department of Radiology (H.J.M.M.M., I.H.P.M., M.A.v.B., J.v.d.G., F.M.A.B.), Department of Gerontology & Geriatrics (A.J.M.d.C., G.J.B.), and Division of Image Processing, Department of Radiology, (J.H.C.R.), Leiden University Medical Centre, Leiden, the Netherlands.