1. Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, Massachusetts.
2. Meyers Primary Care Institute and University of Massachusetts Medical School, Worcester, Massachusetts.
3. Division of Research, Kaiser Permanente Northern California, Oakland, California.
4. Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
5. Institute for Health Research, Kaiser Permanente Colorado, Denver, Colorado.
6. Dana-Farber Cancer Institute and Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
7. HealthPartners Institute, Bloomington, Minnesota.