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机构:
Hosp Univ Penn, Div Gastroenterol & Hepatol, Philadelphia, PA 19104 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, Ctr Clin Epidemiol & Biostat, Dept Biostat Epidemiol & Informat, Perelman Sch Med, Philadelphia, PA USA Hosp Univ Penn, Dept Med, Philadelphia, PA USA