1. Institute for Aging Research, Hebrew SeniorLife, Boston, Massachusetts
2. Department of Medicine, Harvard Medical School, Boston, Massachusetts
3. Division of Gerontology, Beth Israel Deaconess Medical Center, Boston, Massachusetts
4. Center for Advanced Orthopedic Studies, Beth Israel Deaconess Medical Center, Boston, Massachusetts
5. School of Public Health, Boston University, Boston, Massachusetts
6. The National Heart Lung and Blood Institute’s Framingham Heart Study, Framingham, Massachusetts
7. Mercy Catholic Medical Center, Philadelphia, Pennsylvania
8. Quantitative Imaging Center, Boston University School of Medicine, Boston, Massachusetts
9. Department of Orthopedic Surgery, Harvard Medical School, Boston, Massachusetts