1. From the Icelandic Heart Association, Kopavogur, Iceland (S.S., T.A., O.K., E.F.G., G.E., V.G.); The University of Iceland, Reykjavik (T.A., P.V.J., V.G.); Department of Radiology, Leiden University Medical Center, the Netherlands (M.A.v.B.); Laboratory of Epidemiology and Population Science, Demography, and Biometry, National Institute on Aging, National Institutes of Health, Bethesda, MD (L.J.L.); and Department of Psychology, Reykjavik University, Iceland (M.K.J.).