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机构:
Corporal Michael J Crescenz VA Med Ctr, Dept Gastroenterol, Philadelphia, PA USA
Univ Penn, Dept Med, Perelman Sch Med, Philadelphia, PA 19104 USA
Univ Penn, Perelman Sch Med, Dept Epidemiol & Biostat, Philadelphia, PA 19104 USA Corporal Michael J Crescenz VA Med Ctr, Dept Gastroenterol, Philadelphia, PA USA