1. Department of Oncology; University of Ulsan College of Medicine; Seoul Korea
2. Department of Pathology; University of Ulsan College of Medicine; Seoul Korea
3. Department of Hepatobiliary and Pancreatic Surgery, Department of Surgery, Asan Medical Center; University of Ulsan College of Medicine; Seoul Korea
4. Department of Hepatopancreatobiliary surgery and Liver Transplantation, Department of Surgery, Asan Medical Center; University of Ulsan College of Medicine; Seoul Korea