1. Nutrition Research Institute, University of North Carolina at Chapel Hill, Kannapolis
2. Department of Nutrition, University of North Carolina at Chapel Hill, Chapel Hill
3. Intramural Research Program, National Institute on Aging, Bethesda, Maryland
4. School of Medicine, Division of Preventive Medicine, University of Alabama at Birmingham
5. Departments of Psychiatry, Neurology and Epidemiology, University of California, San Francisco