1. Sichuan University-University of Oxford Huaxi Joint for Gastrointestinal Cancer Centre, Sichuan University, Chengdu, Sichuan, China
2. Department of Gastroenterology and Hepatology, West China Hospital, Sichuan University, Chengdu, Sichuan, China
3. Department of Ultrasound, West China Hospital, Sichuan University, Chengdu, Sichuan, China