1. Department of Gastroenterology, First Affiliated Hospital Sun Yat‐sen University Guangzhou Guangdong Province China
2. Department of Gastroenterology Peking University Third Hospital Beijing China
3. Department of Gastroenterology Union Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology Wuhan Hubei Province China
4. Department of Gastroenterology Qilu Hospital of Shandong University Jinan Shandong Province China
5. Department of Gastroenterology, Ruijin Hospital, School of Medicine Shanghai Jiao Tong University Shanghai China