Seoul National University - Department of Surgery, Seoul National University - Department of Surgery, Seoul National University - Division of Colorectal Surgery, National Cancer Center, Korea - Center for Colorectal Cancer, Seoul National University - Medical Research Collaborating Center, Seoul National University - Medical Research Collaborating Center, Seoul National University - Department of Surgery, Hallym University - Department of Surgery, Daehang Hospital - Department of Surgery, National Cancer Center, Korea - Center for Colorectal Cancer, Seoul Metropolitan Boramae Hospital - Department of Surgery, Daehang Hospital - Department of Surgery, Seoul National University - Division of Colorectal Surgery, Seoul National University - Division of Colorectal Surgery, Hallym University - Department of Surgery, Seoul National University - Department of Surgery, Seoul National University - Department of Surgery, Seoul National University - Department of Surgery, Seoul National University - Department of Surgery, Seoul Metropolitan Boramae Hospital - Department of Surgery, Seoul National University - Division of Colorectal Surgery, Seoul National University - Department of Radiology, Seoul National University - Department of Radiology, Seoul National University - Department of Radiation Oncology, Seoul National University - Department of Internal Medicine, Seoul National University - Department of Pathology, Korea University - Department of Preventive Medicine, Seoul National University - Department of Gastoenterology, National Cancer Center, Korea - Center for Colorectal Cancer, Seoul National University - Division of Colorectal Surgery and Independent