Khan, N.
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机构:
Univ Penn, Dept Med, Gastroenterol Sect, Perelman Sch Med, Philadelphia, PA 19104 USA
Univ Penn, Philadelphia VA Med Ctr, Philadelphia, PA 19104 USA
Southeast Louisiana Vet Hlth Care Syst, Gastroenterol Sect, New Orleans, LA USA Univ Penn, Dept Med, Gastroenterol Sect, Perelman Sch Med, Philadelphia, PA 19104 USA