1. Department of Gastroenterology; Peking University Third Hospital; Beijing China
2. State Key Laboratory for Infectious Disease Prevention and Control; Chinese Center for Disease Control and Prevention; National Institute for Communicable Disease Control and Prevention; Beijing China
3. Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases; Hangzhou Zhejiang China
4. Department of Gastroenterology; Qilu Hospital of Shandong University; Shandong China
5. Department of Gastroenterology; Peking Union Medical College Hospital; Beijing China