1. Skeletal Clinical Studies Unit (A.K., C.M.C., M.H.K., M.T.C.), Craniofacial and Skeletal Diseases Branch, National Institute of Dental and Craniofacial Research, Bethesda, Maryland 20892
2. Department of Radiology (R.C.), Mark O. Hatfield Clinical Center, Bethesda, Maryland 20892
3. Surgery Branch (R.E.R., R.M.S.), National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland 20892
4. Department of Orthopedics and Pediatrics (F.M.W.), Georgetown University, Washington, D.C.
5. Division of Geriatric Medicine and Gerontology (N.S.F.), Department of Medicine, Johns Hopkins University, Baltimore, Maryland 21224