1. Department of Surgery, Chung-Ang University College of Medicine, Seoul, Korea
2. Department of Surgery, National Cancer Center, Goyang, Korea
3. Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, Yonsei University College of Medicine, Seoul, Korea
4. Department of Surgery and Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
5. Division of Hepatobiliary and Pancreatic Surgery and Liver Transplantation, Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
6. Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, University of Ulsan College of Medicine, Seoul, Korea
7. Department of Surgery, Jeonbuk National University Medical School, Jeonju, Korea
8. Department of Surgery, Soon Chun Hyang University School of Medicine, Cheonan, Korea
9. Department of Surgery, Gyeongsang National University School of Medicine, Jinju, Korea