1. Division of Epidemiology and Community Health; University of Minnesota; Minneapolis MN USA
2. California Pacific Medical Center Research Institute; San Francisco CA USA
3. Department of Radiology and Biomedical Imaging; University of California; San Francisco CA USA
4. Department of Medicine; University of Minnesota; Minneapolis MN USA
5. Center for Chronic Disease Outcomes Research; Minneapolis VA Health Care System; Minneapolis MN USA
6. Geriatric Research Education and Clinical Center; Minneapolis VA Health Care System; Minneapolis MN USA
7. Department of Epidemiology; University of Pittsburgh; Pittsburgh PA USA
8. Park Nicollet Clinic and HealthPartners Institute; Bloomington MN USA
9. Division of Health Policy and Management; University of Minnesota; Minneapolis MN USA
10. Department of Family Medicine and Public Health; University of California; San Diego, La Jolla CA USA
11. Bone and Mineral Unit; Oregon Health Sciences University; Portland OR USA