Sun Yat-sen University (SYSU) - Department of Radiation Oncology, Sun Yat-sen University (SYSU) - State Key Laboratory of Oncology in South China, Southern Medical University - Department of Radiation Oncology, Zhengzhou University - Department of General Surgery, Kunming Medical University, China Medical University, Government of the People's Republic of China - China-Japan Friendship Hospital, Qingdao University, Guangdong Academy of Medical Sciences - Department of General Surgery, Guangzhou Medical University - Department of Radiation Oncology, University of Science and Technology of China (USTC), Sun Yat-sen University (SYSU) - Department of Radiation Oncology, Sun Yat-sen University (SYSU) - Department of Radiation Oncology, Sun Yat-sen University (SYSU) - Department of Radiation Oncology, Sun Yat-sen University (SYSU) - Department of Radiation Oncology, Sun Yat-sen University (SYSU) - Department of Colorectal Surgery, Sun Yat-sen University (SYSU) - Department of Colorectal Surgery, Sun Yat-sen University (SYSU) - Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, Sun Yat-sen University (SYSU) - Department of Colorectal Surgery, Sun Yat-sen University (SYSU) - Department of Radiation Oncology and University of Texas at Houston - Department of Gastrointestinal Medical Oncology