1. Department of Public Health Sciences, Biological Sciences Division, University of Chicago, Illinois, USA
2. Department of Medicine, Biological Sciences Division, University of Chicago, Illinois, USA
3. VA Boston Healthcare System, Massachusetts, USA
4. Section of General Internal Medicine, Boston University School of Medicine, Massachusetts, USA
5. Department of Medicine, Western Michigan University Homer Stryker M.D. School of Medicine, Kalamazoo, USA
6. Department of Family and Community Medicine, Western Michigan University Homer Stryker M.D. School of Medicine, Kalamazoo, USA
7. Department of Health Management and Policy, University of Iowa, Iowa City, USA
8. Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, USA
9. Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia, USA
10. School of Nursing, University of Minnesota, Minneapolis, USA
11. Division of Health Policy and Management, School of Public Health, University of Minnesota, Minneapolis, USA