1. Department of Digestive Endoscopy, Shanxi Provincial People’s Hospital, Taiyuan, Shanxi, China (mainland)
2. Department of Gastroenterology, Shanxi Cancer Hospital, Taiyuan, Shanxi, China (mainland)
3. Department of Normal Surgical, Shanxi Provincial People’s Hospital, Taiyuan, Shanxi, China (mainland)
4. Department of Gastroenterology, Jincheng People’s Hospital, Jincheng, Shanxi, China (mainland)