1. Department of Gastroenterology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China;
2. Department of Gastroenterology, Hainan General Hospital, Haikou, China;
3. Department of Gastroenterology, The First Hospital, University of South China, Hengyang, China;
4. Department of Gastroenterology, Binzhou Medical University Hospital, Binzhou, China;
5. Department of Gastroenterology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China;
6. Department of Gastroenterology, The Second Affiliated Hospital, University of South China, Hengyang, China;
7. Department of Gastroenterology, Chenzhou First People's Hospital, Chenzhou, China;
8. Department of Gastroenterology, The First Hospital of Lanzhou University, Lanzhou, China;
9. Department of Gastroenterology, Taihe Hospital, Shiyan, China;
10. Department of Gastroenterology, Tianjin Hospital of ITCWM, Nankai Hospital, Tianjin, China;
11. Department of Gastroenterology, Wuxi People's Hospital, Wuxi, China;
12. Department of Gastroenterology, Xuancheng People's Hospital, Xuancheng, China;
13. Department of Gastroenterology, JiangXi PingXiang People's Hospital, Pingxiang, China;
14. Department of Gastroenterology, Huizhou Central People's Hospital, Huizhou, China;
15. Department of Gastroenterology, Xiangya Hospital Central South University, Changsha, China;
16. Department of Gastroenterology, The Fourth People's Hospital of Zigong City, Zigong, China;
17. Department of Gastroenterology, Nanjing First Hospital, Nanjing, China.