1. Laboratory of Epidemiology, Demography, and Biometry; National Institute on Aging National Institutes of Health; Bethesda Maryland
2. Geriatrics Department; Assistance Publique Hopitaux de Paris; Broca Hospital; Paris France
3. Icelandic Heart Association; Kopavogur Iceland
4. Faculty of Psychology; University of Iceland; Reykjavik Iceland
5. Faculty of Medicine; University of Iceland; Reykjavik Iceland
6. Geriatric Research Center; Landspitali University Hospital; Reykjavik Iceland
7. Department of Psychiatry; University of Pittsburgh; Pittsburgh Pennsylvania
8. Department of Neurology; University of Pittsburgh; Pittsburgh Pennsylvania