1. Clinical Endocrinology Branch (R.J.B.), National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20814
2. Skeletal Clinical Studies Unit (M.H.K., M.T.C.), Craniofacial and Skeletal Diseases Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland 20892