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机构:
Univ Penn, Div Gastroenterol & Hepatol, Perelman Sch Med, 3400 Spruce St,Dulles Bldg 2nd Floor, Philadelphia, PA 19104 USA
Corporal Michael J Crescenz VA Med Ctr, Philadelphia, PA USA
Univ Penn, Leonard Davis Inst, Perelman Sch Med, Philadelphia, PA 19104 USA Cleveland Clin, Div Gastroenterol & Hepatol, Cleveland, OH USA