1. Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Surgery, Seoul National University Boramae Hospital, Seoul, Korea.
3. Department of Surgery, Ajou University School of Medicine, Suwon, Korea.
4. Department of Surgery, University of Ulsan College of Medicine, Seoul, Korea.
5. Department of Surgery, Catholic University of Daegu School of Medicine, Daegu, Korea.
6. Department of Surgery, Sungkyunkwan University School of Medicine, Seoul, Korea.
7. Center for Liver Cancer, National Cancer Center, Goyang, Korea.
8. Department of Surgery, Yonsei University College of Medicine, Seoul, Korea.
9. Department of Internal Medicine, The Catholic University of Korea College of Medicine, Seoul, Korea.