1. Division of General Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts (Z.K., R.B.B.)
2. Division of Gastroenterology, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts (J.R.A.)
3. Division of Infectious Diseases, Beth Israel Deaconess Medical Center; Harvard Medical School, Boston, Massachusetts (C.D.A.).