[1] Vet Affairs Boston Healthcare Syst, 1400 VFW Pkwy, Boston, MA 02132 USA
[2] Harvard Med Sch, Boston, MA 02115 USA
[3] Beth Israel Deaconess Med Ctr, Div Gastroenterol & Hepatol, Boston, MA 02215 USA
[4] Beth Israel Deaconess Med Ctr, Dept Med, Boston, MA 02215 USA
[5] Beth Israel Deaconess Med Ctr, Div Gen Med & Primary Care, Boston, MA USA
[6] Brigham & Womens Hosp, Div Gastroenterol & Hepatol & Endoscopy, 75 Francis St, Boston, MA 02115 USA
[7] Brigham & Womens Hosp, Dept Internal Med, 75 Francis St, Boston, MA 02115 USA
[8] Boston Univ, Sch Med, Boston, MA 02118 USA
[9] Univ Michigan, Div Gastroenterol & Hepatol, Ann Arbor, MI 48109 USA
[10] Inst Healthcare Policy & Innovat, Ann Arbor, MI USA
[11] Vet Affairs Ann Arbor Healthcare Syst, Ann Arbor, MI USA