1. Meyers Primary Care Institute and University of Massachusetts Medical School; Worcester MA USA
2. Center for Drug Evaluation and Research; U.S. Food and Drug Administration; Silver Spring MD USA
3. Center for Health Research; Kaiser Permanente Georgia; Atlanta GA USA
4. Division of Research; Kaiser Permanente Northern California; Oakland CA USA
5. Department of Research and Evaluation; Kaiser Permanente Southern California; Pasadena CA USA
6. Pharmacy Analytical Service; Kaiser Permanente; Downey CA USA
7. Institute for Health Research; Kaiser Permanente Colorado; Denver CO USA
8. Department of Population Medicine; Harvard Medical School and Harvard Pilgrim Health Care Institute; Boston MA USA
9. Group Health Research Institute; Seattle WA USA
10. HealthPartners Research Foundation; Bloomington MN USA
11. LCF Research; Albuquerque NM USA
12. Center for Health Research; Kaiser Permanente Northwest; Portland OR USA
13. Department of Pediatrics and Preventive Medicine; Vanderbilt University School of Medicine; Nashville TN USA