1. Department of Gastroenterology; Changhai Hospital, Second Military Medical University; Shanghai China
2. Department of Gastroenterology; Southwest Hospital, Third Military Medical University; Chongqing China
3. Department of Gastroenterology; General Hospital of Shenyang Military Area Command; Shenyang, Liaoning Province China
4. Department of Gastroenterology, Union Hospital, Tongji Medical College; Huazhong University of Science and Technology; Wuhan, Hubei Province China
5. Department of Gastroenterology; The First Hospital of Jilin University; Changchun, Jilin Province China
6. Department of Gastroenterology; Changsha Central Hospital; Changsha, Hunan Province China