1. Orthopedic Biomechanics Laboratory (M.L.B., M.J.D., V.G.), Beth Israel Deaconess Medical Center and Harvard Medical School,Massachusetts 02215
2. Endocrine Division (H.D.), Beth Israel Deaconess Medical Center, Boston, Massachusetts 02215
3. Service of Bone Diseases (D.D.P., S.L.F.), Department of Rehabilitation and Geriatrics, Geneva University Hospital, 1211 Geneva 14, Switzerland