1. Endoscopy Center, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
2. Department of Gastroenterology and Hepatology, Sichuan Academy of Medical Sciences & Sichuan Provincial People’s Hospital, Chengdu, China
3. Ningbo Medical Center, Endoscopic Center of Li Huili Hospital, Ningbo, China
4. Gastroenterology and Endoscopy Center, Wenzhou Central Hospital, Wenzhou, China
5. Department of Digestive Disease, People’s Hospital of Rizhao, Affiliated Clinical Hospital of Jining Medical University, Jining Medical University, Rizhao, China