1. Center for Health Policy & Health Services Research, Henry Ford Health, Detroit, Michigan, USA.
2. Kaiser Permanente Washington Health Research Institute, Seattle, Washington, USA.
3. Department of Health Policy and Behavioral Sciences, Georgia State University School of Public Health, Atlanta, Georgia, USA.
4. Center for Research and Evaluation, Kaiser Permanente Georgia, Atlanta, Georgia, USA.
5. HealthPartners Institute, Minneapolis, Minnesota, USA.
6. Institute for Health Research, Kaiser Permanente Colorado, Aurora, Colorado, USA.
7. Center for Health Research, Kaiser Permanente Northwest, Portland, Oregon, USA.
8. Center for Integrated Health Care Research, Kaiser Permanente Hawaii, Honolulu, Hawaii, USA.
9. Department of Population Medicine, Harvard Medical School, Boston, Massachusetts, USA.
10. Harvard Pilgrim Health Care Institute, Boston, Massachusetts, USA.
11. Essentia Institute of Rural Health, Duluth, Minnesota, USA.