1. Division of Gastroenterology and Hepatology, Key Laboratory of Gastroenterology and Hepatology, Ministry of Health, Renji Hospital, School of MedicineShanghai Jiao Tong University, Shanghai Institute of Digestive Disease Shanghai China
2. Department of EndoscopyThe Sixth People's Hospital Shanghai China
3. Department of EndoscopyHuashan Hospital, Shanghai Shanghai China
4. Shanghai East HospitalTongji University School of Medicine Shanghai China
5. Tongren HospitalShanghai Jiaotong University Shanghai China