1. Center for Advanced Orthopedic Studies; Department of Orthopedic Surgery; Beth Israel Deaconess Medical Center and Harvard Medical School Boston MA USA
2. Academic Unit of Bone Metabolism; University of Sheffield; Sheffield UK
3. California Pacific Medical Center; San Francisco; CA USA
4. Department of Epidemiology and Biostatistics; University of California; San Francisco; San Francisco CA USA
5. Merck & Co., Inc.; Kenilworth NJ USA
6. Amgen Inc.; Thousand Oaks CA USA
7. Eli Lilly and Company; Lilly Research Centre; Windlesham UK
8. Department of Epidemiology; Graduate School of Public Health; University of Pittsburgh; Pittsburgh PA USA
9. Department of Medicine; University of California; San Francisco; San Francisco CA USA