1. Department of Medicine; University of Minnesota; Minneapolis MN USA
2. Division of Epidemiology and Community Health; School of Public Health; University of Minnesota; Minneapolis MN USA
3. Center for Chronic Disease Outcomes Research; VA Health Care System; Minneapolis MN USA
4. California Pacific Medical Center Research Institute; San Francisco CA USA
5. Department of Medicine; University of California; San Francisco CA USA
6. Park Nicollet Clinic; St. Louis Park MN USA
7. Division of Health Policy and Management; School of Public Health; University of Minnesota; Minneapolis MN USA
8. Department of Epidemiology and Biostatistics; University of California; San Francisco CA USA
9. Bone and Mineral Unit; Oregon Health and Science University; Portland OR USA
10. Department of Family Medicine and Public Health; University of California-San Diego; La Jolla CA USA
11. Department of Epidemiology; Graduate School of Public Health; University of Pittsburgh; Pittsburgh PA USA
12. Department of Biomedical Physiology and Kinesiology; Simon Fraser University; Burnaby Canada