1. Department of Surgery, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, Korea
2. Department of Statistics and Interdisciplinary Program in Bioinformatics, Seoul National University, Seoul, Korea
3. Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
4. Department of Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seoul, Korea
5. Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
6. Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, Yonsei University College of Medicine, Seoul, Korea
7. Center for Liver and Pancreatobiliary Cancer, National Cancer Center, Goyang, Korea
8. Pancreatobiliary Cancer Clinic, Department of Surgery, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
9. Department of Surgery, Keimyung University Dongsan Medical Center, Keimyung University School of Medicine, Daegu, Korea
10. Department of Surgery, Ewha Womans University Mokdong Hospital, Ewha Womans University School of Medicine, Seoul, Korea
11. Division of HBP Surgery and Liver Transplantation, Department of Surgery, Korea University College of Medicine, Seoul, Korea
12. Department of Surgery, Jeonbuk National University Medical School, Jeonju, Korea
13. Department of Surgery, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea
14. Department of General Surgery, Bucheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Bucheon, Korea
15. Department of Surgery, Gyeongsang National University Hospital, Gyeongsang National University School of Medicine, Jinju, Korea
16. Department of Surgery, Dong-A University College of Medicine, Busan, Korea
17. Department of Surgery, Dongguk University Ilsan Hospital, Dongguk University College of Medicine, Goyang, Korea
18. Department of Surgery, Konyang University Hospital, Daejeon, Korea
19. Department of Surgery, Daejeon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Daejeon, Korea
20. Department of Surgery, Chonnam National University Hospital, Gwangju, Korea
21. Department of Mathematics and Statistics, Sejong University, Seoul, Korea
22. Department of Surgery and Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea