1. The Permanente Medical Group, Kaiser Permanente Northern California, Oakland
2. Kaiser Permanente Washington Health Research Institute, Seattle
3. Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, Massachusetts
4. Department of Research and Evaluation, Kaiser Permanente Southern California, Pasadena
5. HealthPartners Institute, HealthPartners, Minneapolis, Minnesota
6. RAND Corporation, Santa Monica, California
7. Institute for Health Research, Kaiser Permanente Colorado, Aurora
8. Division of Research, Kaiser Permanente Northern California, Oakland