作者单位:Christian Med Coll & Hosp, Div Gastrointestinal Sci, Wellcome Trust Res Lab, Vellore 632004, Tamil[1]Christian Med Coll & Hosp, Dept Gastroenterol, Vellore 632004, Tamil Nadu, India[2]Christian Med Coll & Hosp, Dept Gen Surg & Upper GI Surg, Vellore 632004, Tamil Nadu, India[3]