1. Department of Surgery and Cancer Research Institute; Seoul National University College of Medicine; Seoul Korea
2. Department of Surgery; Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul Korea
3. Center for Liver Cancer; National Cancer Center; Goyang Korea
4. Pancreatobiliary Cancer Clinic; Department of Surgery; Gangnam Severance Hospital; Yonsei University College of Medicine; Seoul Korea
5. Department of Surgery; Chonbuk National University Medical School; Jeonju Korea
6. Division of Hepatobiliary and Pancreatic Surgery; Department of Surgery; Keimyung University Dongsan Medical Center; Daegu Korea
7. Department of Surgery; Kyungpook National University College of Medicine; Daegu Korea
8. Department of Surgery; Seoul National University Bundang Hospital; Seongnam Korea