1. Department of General Surgery, The First Hospital of Lanzhou University, Lanzhou, Gansu 730000, China
2. Key Laboratory of Biological Therapy and Regenerative Medicine Transformation Gansu Province, Lanzhou, Gansu 730000, China
3. Division of Gastroenterology and Hepatology, UC Davis Medical Center, Sacramento, CA 95816, USA
4. Department of Minimally Invasive Surgery, Tianjin Nankai Hospital, Tianjin 300100, China
5. Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, Shulan (Hangzhou) Hospital Affiliated to Zhejiang Shuren University, Hangzhou, Zhejiang 310000, China
6. Department of Hepatobiliary Surgery, Southwest Hospital, Army Medical University, Chongqing 400000, China
7. Hepatobiliary Surgery Department, Shandong Provincial Third Hospital, Jinan, Shandong 250000, China
8. Department of General Surgery, Xinhua Hospital, Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Biliary Tract Disease Research, Shanghai 200000, China
9. Department of Hepatobiliary and Pancreatic Surgery, The First Hospital of Jilin University, Changchun, Jilin 130000, China
10. Department of Hepatobiliary Surgery, The General Hospital of Ningxia Medical University, Yinchuan, Ningxia 750000, China
11. Department of Hepatobiliary & Hydatid, Digestive and Vascular Surgery Center, Xinjiang Key Laboratory of Echinococcosis and Liver Surgery Research, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, Xinjiang 830000, China
12. Department of Hepatobiliary and Pancreatic Surgery, The First Hospital of Shanxi Medical University, Taiyuan, Shanxi 030000, China
13. Department of General Surgery, The Second Hospital of Lanzhou University, Lanzhou, Gansu 730000, China
14. Department of Biliopancreatic Endoscopic Surgery, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, China
15. Gastrointestinal Surgery Department, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430000, China
16. Department of Hepatobiliary Surgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710000, China
17. Department of Hepatobiliary Surgery, the Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong 510260, China
18. Division of Biliopancreatic Surgery, Department of General Surgery, Second Xiangya Hospital, Central South University, Changsha, Hunan 410000, China
19. The First Clinical Medical College of Lanzhou University, Lanzhou, Gansu 730000, China
20. Clinical Research Centre, Scientific Research Centre, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518000 China
21. Department of Gastroenterology, Hamamatsu Medical Center, Hamamatsu 9800021, Japan
22. Department of Gastroenterology, Kyoto Second Red Cross Hospital, Kyoto 201101, Japan
23. Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
24. Department of Public Health, College of Health Sciences, Qatar University, Doha 2713, Qatar
25. International Agency for Research on Cancer (IARC), Lyon 69000, France.