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机构:
Corporal Michael J Crescenz Vet Affairs Med Ctr, Philadelphia, PA USA
Univ Penn, Perelman Sch Med, Div Gastroenterol & Hepatol, Philadelphia, PA 19104 USA
Univ Penn, Perelman Sch Med, Leonard David Inst Hlth Econ, Philadelphia, PA 19104 USA
Univ Penn, Perelman Sch Med, Dept Biostat Epidemiol & Informat, Ctr Clin Epidemiol & Biostat, Philadelphia, PA USA Yale Sch Med, Sect Digest Dis, New Haven, CT USA