1. Department of Gastroenterology and Hepatology, West China Hospital of Sichuan University, Chengdu, Sichuan, China
2. Sichuan University-Oxford University Huaxi Gastrointestinal Cancer Centre, West China Hospital of Sichuan University, Chengdu, Sichuan, China
3. Department of Gastroenterology and Hepatology, West China Hospital of Sichuan University, 37 Guo Xue Lane, Chengdu, Sichuan 610041, China
4. University-Oxford University Huaxi Gastrointestinal Cancer Centre, West China Hospital of Sichuan University, Chengdu, Sichuan, China