作者单位:Hosp Univ Penn, Dept Med, 3400 Spruce St, Philadelphia, PA 19104 USA[1]Icahn Sch Med Mt Sinai, Dept Med, Div Gastroenterol, One Gustave L Levy Pl,Box 1069, New York, NY[2]Icahn Sch Med Mt Sinai, Dept Pathol, Div Gastrointestinal Pathol, New York, NY 10029 USA[3]White Plains Hosp, Dept Surg, White Plains, NY USA[4]