| Affiliation: | 1. Department of Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea;2. Department of Surgery, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea;3. Department of Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea;4. Department of Surgery, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea;5. Department of Surgery, Samsung Medical Center, Sungkyunkwan University College of Medicine, Seoul, Korea |
