1. Division of General Internal Medicine and Health Services Research, David Geffen School of Medicine at University of California, Los Angeles
2. Fred Hutchinson Cancer Research Center, Seattle, Washington
3. Department of Epidemiology, Herbert Wertheim School of Public Health and Human Longevity Science, University of California, San Diego, La Jolla
4. Center for Healthcare Policy and Research, Department of Medicine, UC Davis Medical Center Sacramento, California
5. Department of Epidemiology and Environmental Health, University at Buffalo, State University of New York, Buffalo
6. Department of Preventive Medicine, University of Tennessee Health Science Center, Memphis
7. General Internal Medicine, University of Florida College of Medicine, Gainesville
8. California Pacific Medical Center, San Francisco
9. Veterans Affairs Palo Alto Health Care System, Palo Alto, California
10. Department of Psychiatry and Behavioral Sciences, Stanford University, Palo Alto, California
11. The Ohio State University Wexner Medical Center, Department of Internal Medicine, Columbus
12. The Ohio State University Wexner Medical Center, General Internal Medicine and Geriatrics, Columbus
13. Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania