1. Department of Neurology (H.E., L.W.P., R.D.-A., S.E.K., A.L.C.S.), University of Pennsylvania, Philadelphia.
2. National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD (R.F.G.).
3. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD (J.C., S.K.).
4. The Memory Impairment and Neurodegenerative Dementia Center, University of Mississippi Medical Center, Jackson (T.H.M.).
5. School of Health Professions, Tel Aviv University, Israel (S.K.).
6. Department of Biostatistics, Epidemiology, and Informatics, School of Medicine (A.L.C.S.), University of Pennsylvania, Philadelphia.