1. Department of Medicine (E.S.S., J.P.B., M.R.R.), College of Physicians and Surgeons of Columbia University, New York, New York 10032
2. Department of Epidemiology and Biostatistics (D.M.B.), University of California–San Francisco, San Francisco, California 94105
3. Department of Medicine (R.S.B.), Weill-Cornell Medical College, New York, New York 10021
4. Michigan Bone and Mineral Clinic (H.G.B.), Detroit, Michigan 48236
5. Department of Medicine (M.C.H.), University of Maryland School of Medicine, Baltimore, Maryland 21201
6. Oregon Osteoporosis Center (M.R.M.), Portland, Oregon 97218
7. Department of Medicine (T.J.S.), Northwestern University Medical School, Chicago, Illinois 60611