1. Clinical and Research Center of FGID & DGIM, Department of Gastroenterology, Peking Union Medical College Hospital, Beijing, China
2. Department of Gastroenterology, Changhai Hospital of Shanghai, Shanghai, China
3. Department of Gastroenterology, Shanghai Ruijin Hospital, Shanghai, China
4. Department of Gastroenterology, Qilu Hospital of Shangdong University affiliated to Capital Medical University, Jinan, China
5. Department of Gastroenterology, Jiangsu Province Hospital, Nanjing, China
6. Department of Gastroenterology, Beijing Chaoyang Hospital, Beijing, China
7. Department of Gastroenterology, Tongji Medical College, Union Hospital, Huazhong Science Technology University, Wuhan, China
8. Department of Internal Medicine, Kyung Hee University Hospital, Seoul, Korea