1. Zhongshan Hospital, Department of General Surgery, Fudan University, Shanghai, China
2. Union Hospital, Department of General Surgery, Fujian Medical University, Fuzhou, China
3. Department of General Surgery, The First Affiliated Hospital with Nanjing Medical University, Nanjing, China
4. Beijing Cancer Hospital, Department of General Surgery, Peking University, Beijing, China
5. Renji Hospital, Department of General Surgery, Shanghai Jiao Tong University, Shanghai, China
6. Department of General Surgery, The First Affiliated Hospital of Fujian Medical University, Fuzhou, China
7. Department of General Surgery, Chinese PLA General Hospital, Beijing, China
8. Shanghai Cancer Center, Department of General Surgery, Fudan University, Shanghai, China
9. West China Hospital, Department of General Surgery, Sichuan University, Chengdu, China
10. Nanfang Hospital, Department of General Surgery, Southern Medical University, Guangzhou, China
11. Department of General Surgery, The First Hospital Affiliated to AMU, Chongqing, China
12. Department of General Surgery, Guangdong General Hospital, Guangzhou, China
13. Department of General Surgery, The First Hospital of Jilin University, Changchun, China
14. Department of Biostatistics, Fudan University School of Public Health, Shanghai, China