1. Division of Endocrinology, University of Pittsburgh Medical Center (B.B.), Pittsburgh, Pennsylvania 15261
2. Divisions of Gastroenterology (L.C.H.) and Endocrinology, Zentrum fuer Innere Medizin, Philipps University, Marburg D-35033, Germany
3. Endocrine Research Unit (T.T., F.G., S.K., L.R.), Mayo Clinic, Rochester, Minnesota 55905
4. Department of Orthopedics (G.L.E., R.T.T.), Mayo Clinic, Rochester, Minnesota 55905