1. Department of Surgery and Science, Kyushu University, Fukuoka, Japan.
2. Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Department of Liver Transplantation and Hepatobiliary and Pancreatic Surgery, Asan Medical Center, Ulsan University School of Medicine, Seoul, Korea.
4. Department of Surgery, Shinshu University School of Medicine, Matsumoto, Japan.
5. Division of Hepatobiliary and Pancreatic Surgery and Liver Transplantation, Department of Surgery, Korea University College of Medicine, Seoul, Korea.