1. National Institute on Aging, National Institute of Health, Intramural Research Program, Baltimore, MD 21224
2. Department of Epidemiology, University of Michigan, Ann Arbor, MI 48109
3. Center for Human Nutrition, Department of International Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205
4. Graduate Program in Public Health, Eastern Virginia Medical School, Norfolk, VA 23501