1. Department of Kinesiology, University of Maryland, College Park, Maryland;
2. Department of Human Genetics, University of Pittsburgh, Pittsburgh, Pennsylvania;
3. Division of Gerontology, University of Maryland, School of Medicine, Baltimore, Maryland;
4. Department of Physical Therapy, University of Maryland Eastern Shore, Princess Anne, Maryland;
5. The Jean Mayer USDA HNRC on Aging at Tufts University, Boston, Massachusetts;
6. Department of Radiology, Baltimore VA Medical Center, Baltimore, Maryland;
7. Gerontology Research Center, National Institute on Aging, Baltimore, Maryland; and
8. Florida Gerontological Research and Training Services, Palm Harbor, Florida.