1. Bone and Mineral Unit (E.O., C.M.N., L.M.M., L.L., K.F.H.), Oregon Health and Science University, Portland, Oregon 97239
2. Palo Alto VA Medical Center (A.R.H.), Palo Alto, California 94304
3. University of California, San Diego (E.B.-C., T.D.), San Diego, California 92093
4. University of Alabama (J.M.S.), Birmingham, Alabama 35294
5. Department of Epidemiology (J.A.C.), University of Pittsburgh, Pittsburgh, Pennsylvania 15260