1. Department of Medicine, Division of Clinical Immunology/Rheumatology (J.R.C.), University of Alabama at Birmingham, Birmingham, Alabama 35294
2. Department of Medicine, Epidemiology and Biostatistics (S.K.E., D.C.B.), University of California, San Francisco, San Francisco, California 94143
3. Department of Epidemiology (J.A.C.) University of Pittsburgh, Pittsburgh, Pennsylvania 15261
4. San Francisco Coordinating Center (P.M.C.), California Pacific Medical Center, San Francisco, California 94107
5. Division of Epidemiology (E.B.-C.), Department of Family and Preventive Medicine, University of California, San Diego, California 92093
6. Department of Medicine (E.M.H.), Portland, Oregon 97239
7. Department of Medicine (A.I.), University of Minnesota, Minneapolis, Minnesota 55404
8. Department of Medicine, Endocrinology (S.O.), Columbia University, New York, New York 10032
9. Bone and Mineral Unit (E.O.), Oregon Health and Science University, Portland, Oregon 97239