1. From the Center on Aging and Health, Division of Geriatric Medicine and Gerontology, Johns Hopkins University, Baltimore, MD (D.L.R., O.C.S., C.L.)
2. School of Aging Studies, University of South Florida, Tampa (W.E.H.)
3. Department of Psychology, School of Social and Behavioral Sciences (O.J.C.), University of Alabama at Birmingham
4. Department of Biostatistics, School of Public Health (J.D.R., S.E.J.), University of Alabama at Birmingham
5. Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY (M.D.).