1. Department of Medicine University of Calgary Calgary Alberta Canada
2. Department of Epidemiology Johns Hopkins Bloomberg School of Public Health Baltimore MD
3. Department of Mathematics and Statistics Boston University Boston MA
4. Department of Biostatistics Boston University School of Public Health Boston MA
5. Division of Infectious Diseases Massachusetts General Hospital Boston MA
6. Harvard Medical School Boston MA
7. Division of General Internal Medicine Massachusetts General Hospital Boston MA
8. Biostatistics Center Massachusetts General Hospital Boston MA
9. University of Washington Seattle WA
10. McGill University Health Centre Montreal QC Canada
11. Department of Medicine, Division of Infectious Diseases and Global Public Health University of California San Diego CA
12. Harvard T.H. Chan School of Public Health Boston MA
13. Kaiser Permanente Northern California Oakland CA
14. Johns Hopkins University School of Medicine Baltimore MD
15. Veterans Affairs Connecticut Healthcare System West Haven CT
16. Kaiser Permanente Mid‐Atlantic States Rockville MD
17. Vanderbilt University School of Medicine Nashville TN