1. West China Hospital, Sichuan University; Department of Digestive Disease; No. 37, Guo Xue Xiang Chengdu Sichuan China 610041
2. West China Hospital, Sichuan University; Department of Gastroenterology; No. 37, Guo Xue Xiang Chengdu Sichuan China 610041
3. The Third People's Hospital; Department of Digestive Disease; Chengdu Sichuan China