1. Center for Liver and Pancreatobiliary Cancer, Research Institute and Hospital, National Cancer Center, Goyang, Korea
2. Department of Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
3. Department of Pathology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
4. Department of Internal Medicine and Liver Research Institute, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea