1. Division of Internal Medicine, Department of Medicine, and
2. Department of Epidemiology, School of Public Health, The Johns Hopkins University, Baltimore, Maryland;
3. Center on Aging and Health, The Johns Hopkins Medical Institutions, Baltimore, Maryland;
4. Center for Studies on Aging and Care of the Elderly (UNATI), Rio de Janeiro State University (UERJ), Rio de Janeiro, Brazil;
5. Epidemiology, Demography, and Biometry Program, National Institute on Aging, Bethesda, Maryland.