affiliation not provided to SSRN, Seoul National University - Seoul National University Hospital, Seoul National University - Seoul National University Hospital, University of Pennsylvania - Department of Biostatistics, Epidemiology, and Informatics, University of Pennsylvania, Seoul National University - Seoul National University Hospital, Seoul National University, Seoul National University, Seoul National University, Seoul National University - Seoul National University Bundang Hospital, Seoul National University - Department of Surgery, Seoul National University - Department of Surgery, National Cancer Center, Korea - Center for Colorectal Cancer, National Cancer Center, Korea - Center for Colorectal Cancer and National Cancer Center, Korea - Center for Colorectal Cancer