1. Division of General Internal Medicine Massachusetts General HospitalBoston Massachusetts
2. Epidemiology Department School of Public Health Boston University Boston Massachusetts
3. Division of Research Kaiser Permanente Northern California Oakland California
4. Department of Epidemiology Biostatistics and Medicine University of California San Francisco San Francisco California
5. Department of Health Research and Policy School of Medicine Stanford University Stanford California
6. Department of Medicine University of California San Francisco San Francisco California
7. Department of Environmental and Occupational Health Milken Institute School of Public Health George Washington University Washington District of Columbia