1. National Institute on Aging (M.A.B., A.B.Z.), National Institutes of Health Intramural Research Program, Baltimore, Maryland 21224;
2. Department of Internal Medicine (A.B.), Johns Hopkins University, School of Medicine, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland 21205;
3. Department of Epidemiology (M.R.S.), Michigan State University, East Lansing, Michigan 48824;
4. Graduate Program in Public Health (H.A.B.), Eastern Virginia Medical School, Norfolk, Virginia 23507
5. Center for Human Nutrition (Y.W.), Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland 21205;