1. Endoscopy Center and Endoscopy Research Institute, Zhongshan Hospital, Fudan University, Shanghai, China
2. Department of General Surgery, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
3. The Laboratory Center of Medical School of Hangzhou Normal University, Hangzhou, China
4. Department of General Surgery, Xinhua Hospital, Shanghai JiaoTong University, School of Medicine, Shanghai, China
5. Institute of Biliary Tract Diseases, Shanghai JiaoTong University School of Medicine, Shanghai, China