1. Tufts University School of Medicine (C.J.R.), Boston, Massachusetts 02111;
2. UCLA-Orthopaedic Hospital Department of Orthopedic Surgery (J.S.A.), University of California, Los Angeles, California 90095;
3. University of California (D.D.B.), San Francisco, California 94121;
4. Department of Epidemiology and Biostatistics (D.M.B.), University of California, San Francisco, California 94143;
5. Endocrine Unit (M.B.D.), Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114;
6. Harvard Medical School (J.E.M.), Brigham and Women's Hospital, Boston, Massachusetts 02215;
7. College of Medicine (M.H.M.), Mayo Clinic, Rochester, Minnesota 55905;
8. Memorial University of Newfoundland (C.S.K.), St. John's, Newfoundland and Labrador, Canada A1B 3V6