1. Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Surgery, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
3. Department of Surgery, Ewha Womans University Medical Center, Seoul, Korea.
4. Pusan National University Hospital, Busan Cancer Center, Busan, Korea.
5. Cancer Research Institute, Seoul National University, Seoul, Korea.
6. Department of Rehabilitation Medicine, Seoul National University College of Medicine, Seoul, Korea.