1. Hebrew Rehabilitation Center for Aged Research and Training Institute, Boston, Massachusetts.
2. The Department of Medicine of Beth Israel Deaconess Medical Center, and Division on Aging, Harvard Medical School, Boston, Massachusetts.
3. Institute of Gerontology, Ann Arbor, Michigan.
4. Institute of Gerontology and School of Public Health, University of Michigan, Ann Arbor VA Medical Center, Ann Arbor, Michigan.