Sun Yat-sen University (SYSU) - Department of Radiation Oncology, Sun Yat-sen University (SYSU) - Department of Radiation Oncology, Government of the People's Republic of China - Beijing Hospital, Sun Yat-sen University (SYSU) - State Key Laboratory of Oncology in South China, Southern Medical University - Department of Radiation Oncology, University of Electronic Science and Technology of China (UESTC) - Sichuan Cancer Center, University of Texas at Houston - MD Anderson Cancer Center, Zhejiang University - Department of Medical Oncology, Zhejiang University - Department of Medical 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 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), Sun Yat-sen University (SYSU) - Department of Gastroenterological Surgery, Sun Yat-sen University (SYSU) - Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, Sun Yat-sen University (SYSU) - Department of Gastroenterological Surgery, Sun Yat-sen University (SYSU) - Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, Sun Yat-sen University (SYSU) - Department of Gastroenterological Surgery, Sun Yat-sen University (SYSU) - Department of Gastroenterological Surgery, Sun Yat-sen University (SYSU) - Department of Gastroenterological Surgery, University of Electronic Science and Technology of China (UESTC) - Sichuan Cancer Center, Louisiana State University, New Orleans, Harvard University - Beth Israel Deaconess Medical Center, Sun Yat-sen University (SYSU) - Sixth Affiliated Hospital, Sun Yat-sen University (SYSU) - Department of Radiation Oncology and University of Texas at Houston - Department of Gastrointestinal Medical Oncology