1. Bone and Mineral Unit (E.S.L., C.M.N., L.M.M., J.A.L., E.S.O.), Oregon Health and Science University, Portland, Oregon 97239
2. Department of Family and Preventive Medicine (E.B.-C., G.L.), University of California, San Diego, San Diego, California 92093
3. Departments of Medicine and Epidemiology & Community Health (K.E.E.), Veterans Affairs Medical Center, Minneapolis, Minnesota 55417
4. University of Minnesota and Department of Medicine (K.E.E.), Veterans Affairs Medical Center, Minneapolis, Minnesota 55417
5. Department of Medicine (A.R.H.), Stanford University, Palo Alto, California 94305
6. Department of Internal Medicine (C.O.), Center for Bone Research at the Sahlgrenska Academy, SE-416 85 Göteborg, Sweden