1. Center for Clinical and Translational Research, Maine Medical Center Research Institute, Scarborough, ME, USA
2. Center for Bone Quality, Department of Endocrinology, Leiden University Medical Center, ZA Leiden, The Netherlands
3. Department of Medicine, UC San Diego, La Jolla, CA, USA
4. VA San Diego Healthcare System, San Diego, CA, USA
5. Icelandic Heart Association Research Institute, Kopavogur, Iceland
6. Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, CA, USA
7. Program of Advanced Musculoskeletal Imaging (PAMI), Cleveland Clinic, Cleveland, OH, USA
8. Faculty of Medicine, University of Iceland, Reykjavik, Iceland
9. Department of Family Medicine and Public Health, UC San Diego, La Jolla, CA, USA
10. National Institute on Aging, National Institutes of Health (NIA, NIH), Bethesda, MD, USA
11. Department of Medicine, University of California San Francisco, San Francisco, CA, USA
12. Endocrine Research Unit, San Francisco Veterans Affairs Health Care System, San Francisco, CA, USA
13. The Mount Sinai Bone Program and Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA