1. Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School; Division of Gastroenterology and Hepatology, Department of Medicine, Massachusetts General Hospital, Harvard Medical School; and Clinical and Translational Epidemiology Unit (CTEU), Massachusetts General Hospital, Boston, Massachusetts (T.G.S.)
2. Division of General Internal Medicine, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts (D.E.S.)
3. Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts (Y.Z., J.M.M., A.C., E.D.)
4. Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, and Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts (K.J.L.).