1. Endocrine Division , Department of Medicine, Massachusetts General Hospital, , Boston, MA 02114, United States
2. Harvard Medical School , Department of Medicine, Massachusetts General Hospital, , Boston, MA 02114, United States
3. Department of Epidemiology , School of Public Health, , Birmingham, AL 35294, United States
4. University of Alabama at Birmingham , School of Public Health, , Birmingham, AL 35294, United States
5. Center for Care Delivery and Outcomes Research, Minneapolis VA Health Care Center , Minneapolis, MN 55417, United States
6. Department of Medicine, University of Minnesota , Minneapolis, MN 55455, United States
7. Department of Anthropology and Center for Civil Rights and Racial Justice, University of Pittsburgh , Pittsburgh, PA 15260, United States
8. Division of General Internal Medicine and Health Services Research , Department of Medicine, , Los Angeles, CA 90049, United States
9. David Geffen School of Medicine at University of California , Department of Medicine, , Los Angeles, CA 90049, United States
10. Department of Internal Medicine , Max Rady College of Medicine, , Winnipeg R3E 3P5, Canada
11. University of Manitoba , Max Rady College of Medicine, , Winnipeg R3E 3P5, Canada
12. Department of Radiology , Max Rady College of Medicine, , Winnipeg R3E 3P5, Canada
13. Department of Epidemiology , School of Public Health, , Pittsburgh, PA 15261, United States
14. University of Pittsburgh , School of Public Health, , Pittsburgh, PA 15261, United States