1. Department of Gastroenterology and Endoscopy, Huashan Hospital, Fudan University, Shanghai 200040, China
2. Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai 200433, China
3. Department of Gastroenterology, 928 Hospital of PLA Joint Logistics Force, Haikou 570100, China
4. Department of General Surgery, Changhai Hospital, Naval Medical University, Shanghai 200433, China
5. Key Laboratory of Public Health Safety of Ministry of Education, School of Public Health, Fudan University, Shanghai 200032, China
6. National Clinical Research Center for Digestive Diseases, Shanghai 200433, China