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机构:
Univ Penn, Perelman Sch Med, Dept Biostat Epidemiol & Informat, Philadelphia, PA USA
Hosp Univ Penn, Dept Med, Div Gastroenterol & Hepatol, Philadelphia, PA USA
Corporal Michael J Crescenz VA Med Ctr, Dept Med, Philadelphia, PA USA
Univ Penn, Perelman Sch Med, Leonard David Inst Hlth Econ, Philadelphia, PA USA
Univ Penn, Div Gastroenterol, 3400 Civ Ctr Blvd, Philadelphia, PA 19104 USA Hosp Univ Penn, Dept Med, Philadelphia, PA USA