1. Department of Surgery, Dongnam Institute of Radiological and Medical Sciences, Busan, Korea.
2. Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Surgery, Seoul National University Bundang Hospital, Seongnam, Korea.
4. Center for Colorectal Cancer, National Cancer Center, Goyang, Korea.
5. Department of Surgery, Seoul Metropolitan Government - Seoul National University Boramae Medical Center, Seoul, Korea.