1. Department of Gastroenterology Peking Union Medical College Hospital, Chinese Academy of Medical Sciences Beijing China
2. Department of Pathology Peking Union Medical College Hospital, Chinese Academy of Medical Sciences Beijing China
3. Department of Gastroenterology General Hospital of the People's Liberation Army Beijing China
4. Department of Gastroenterology Beijing Friendship Hospital, Capital Medical University Beijing China
5. Department of Gastroenterology Beijing Chao‐Yang Hospital, Capital Medical University Beijing China
6. Department of Gastroenterology Beijing Shijitan Hospital, Capital Medical University Beijing China
7. Gastrointestinal Cancer Center Peking University Cancer Hospital Beijing China
8. Department of Gastroenterology, Beijing Luhe Hospital Capital Medical University Beijing China