1. Department of Medicine UC San Diego La Jolla CA USA
2. Department of Medicine VA San Diego Healthcare System San Diego CA USA
3. Department of Epidemiology and Biostatistics University of California San Francisco CA USA
4. Department of Medicine University of California San Francisco CA USA
5. Endocrine Research Unit San Francisco Veterans Affairs Health Care System San Francisco CA USA
6. Icelandic Heart Association Research Institute Reykjavik Iceland
7. Faculty of Medicine University of Iceland Reykjavik Iceland
8. Department of Radiology University of California San Francisco CA USA
9. Department of Medicine Stanford University Palo Alto CA USA
10. Department of Medicine Veterans Affairs Palo Alto Health Care System Palo Alto CA USA
11. Center for Clinical and Translational Research Maine Medical Center Research Institute Scarborough ME USA
12. Program of Advanced Musculoskeletal Imaging (PAMI) Cleveland Clinic Cleveland OH USA