1 Department of Gastroenterology and, Sichuan University-Oxford University Huaxi Gastrointestinal Cancer, Department of Gastroenterology & Hepatology, West China Hospital, Sichuan University, Chengdu, Sichuan, China.
2 Department of Gastroenterology and, COVID19 Medical Team (Hubei), West China Hospital, Sichuan University, Chengdu, Sichuan, China; Medical Assistance Teams, East Branch of the Renmin Hospital of Wuhan University, Wuhan, China; Sichuan University-Oxford University Huaxi Gastrointestinal Cancer, Department of Gastroenterology & Hepatology, West China Hospital, Sichuan University, Chengdu, Sichuan, China.