1. Department of Gastroenterology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
2. Department of Gastroenterology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China
3. Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan, Shandong, P.R, China
4. Department of Gastroenterology, First Hospital of Shanxi Medical University, Taiyuan, Shanxi Province, China
5. Division of Gastroenterology and Hepatology, Key Laboratory of Gastroenterology and Hepatology, Ministry of Health, Inflammatory Bowel Disease Research Center, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai Institute of Digestive Disease, Shanghai, China
6. Medical Research Center, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing, China
7. Department of Gastroenterology, The Second Hospital of Hebei Medical University, Shijiazhuang, China