Institution: | 1.Department of Gastroenterology, The Shanghai Tenth People''s Hospital of Tongji University, Shanghai 200072, P.R. China;2.Department of General Surgery, Zhongshan Hospital of Fudan University, Shanghai 200032, P.R. China;3.Department of Gastroenterology, Zhengzhou Central Hospital Affiliated to Zhengzhou University, Zhengzhou, Henan 450007, P.R. China |