1. Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
2. Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA
3. Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA
4. Clinical and Quality Analysis, Information Systems, Partners HealthCare System, Boston, MA
5. Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
6. Clinical Informatics, Partners eCare, Partners HealthCare System, Boston, MA
7. Department of Pharmacy, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
8. Anticoagulation Management Service, Department of Nursing, Massachusetts General Hospital, Boston, MA