[Zhang, Yiqun; Yao, Liqing; Xu, Meidong; Li, Quanlin; Cai, Mingyan; Qin, Wenzheng; Xu, Jiaxin; Huang, Yuan; Zhou, Pinghong] Fudan Univ, Zhongshan Hosp, Endoscopy Ctr, Shanghai, Peoples R China; [Zhang, Yiqun; Yao, Liqing; Xu, Meidong; Li, Quanlin; Cai, Mingyan; Qin, Wenzheng; Xu, Jiaxin; Huang, Yuan; Zhou, Pinghong] Fudan Univ, Zhongshan Hosp, Endoscopy Res Inst, Shanghai, Peoples R China; [Wang, Yan] Nanjing Med Univ, Affiliated Hosp 1, Dept Gastrointestinal Endoscopy, Nanjing, Jiangsu, Peoples R China