1. Department of Endoscopy, Fudan University Shanghai Cancer Center, Shanghai, China
2. Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
3. Department of Gastrointestinal Endoscopy, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
4. Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
5. Department of Biliary-Pancreatic Surgery, and Department of Oncology, State Key Laboratory for Oncogenes and Related Genes, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China