1. Department of Internal Medicine (V.S.V.), University Hospital of Zürich, 8091 Zürich, Switzerland
2. Department of General Internal Medicine (N.R.), Inselspital, University Hospital of Bern, 3010 Bern, Switzerland
3. California Pacific Medical Center Research Institute (L.H.), San Francisco, California 94107
4. Stanford University Medical School (A.R.H.), Palo Alto, California 94305
5. Bone and Mineral Unit (E.S.O.), Oregon Health & Science University, Portland, Oregon 97239
6. Department of Medicine (K.E.E.), Minneapolis, Minnesota 55455
7. Division of Epidemiology and Community Health (K.E.E.), University of Minnesota, Minneapolis, Minnesota 55455
8. Center for Chronic Disease Outcomes Research (K.E.E.), Minneapolis Veterans Affairs Health Care System, Minneapolis, Minnesota 55417, Departments of Medicine and Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, California 94143