1. Division of Infectious Diseases, Department of Medicine, Perelman School of Medicine; University of Pennsylvania; Philadelphia PA USA
2. Center for Clinical Epidemiology and Biostatistics, Department of Biostatistics and Epidemiology, Perelman School of Medicine; University of Pennsylvania; Philadelphia PA USA
3. Division of Gastroenterology, Department of Medicine, Perelman School of Medicine; University of Pennsylvania; Philadelphia PA USA
4. HealthPartners Institute for Education and Research; Bloomington MN USA
5. HealthCore, Inc.; Wilmington DE USA
6. Engelberg Center for Health Care Reform; The Brookings Institution; Washington DC USA
7. Pharmacy Analytical Service; Kaiser Permanente Southern California; Downey CA 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. Vanderbilt University School of Medicine; Nashville TN USA
11. Competitive Health Analytics; Humana Inc.; Louisville KY USA
12. Marshfield Clinic Research Foundation; Marshfield WI USA
13. U.S. Food and Drug Administration; Silver Spring MD USA