1. Department of Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
2. Department of Surgery and Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Pathology, KEPCO Medical Foundation, Hanil General Hospital, Seoul, Korea.
4. Department of Surgery, Ewha Womans University School of Medicine, Seoul, Korea.
5. Department of Surgery, National Police Hospital, Seoul, Korea.