1. Center of Infectious Diseases, West China Hospital of Sichuan University, Chengdu 610041, China
2. Division of Infectious Diseases, State Key Laboratory of Biotherapy and Center of Infectious Diseases, West China Hospital of Sichuan University, Chengdu 610041, China
3. Department of Gastroenterology, Kanazawa University Hospital, Kanazawa 9208641, Japan