1. Academic Unit of Bone Metabolism (R.E.), University of Sheffield, Sheffield S5 7AU, United Kingdom
2. Department of Epidemiology and Biostatistics (D.M.B., L.P.), University of California at San Francisco, San Francisco, California 94107
3. Leuven University Center for Metabolic Bone Diseases and Division of Geriatric Medicine (S.B.), Katholieke Universiteit Leuven, 3000 Leuven, Belgium
4. Rheumatology Unit (S.A.), University of Verona, Ospedale Maggiore, 37126 Verona, Italy
5. Centre of Muscle and Bone Research (D.F.), Free University and Humboldt-University, 12203 Berlin, Germany
6. Osteoporosis Policlinic (K.L.), University Hospital and University of Bern, 3010 Bern, Switzerland
7. San Francisco Coordinating Center (S.R.C.), University of California, San Francisco, California 94107
8. Institut National de la Santé et de la Recherche Médicale Research Unit 831 and University of Lyon (P.D.D.), 69437 Lyon, France
9. Novartis Pharmaceuticals Corporation (P.M.), East Hanover, New Jersey 07936
10. Department of Epidemiology (J.A.C.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261