1. Jean Mayer U.S. Department of Agriculture Human Nutrition Research Center on Aging at Tufts University, Boston, MA 02111
2. Yale University School of Medicine, New Haven, CT 06510
3. Hebrew Rehabilitation Center for Aged Research and Training Institute and Harvard School of Medicine, Boston, MA 02131
4. Boston University School of Medicine and the National Heart, Lung and Blood Institute's Framingham Heart Study, Boston, MA 01702