1. Department of Radiotherapy, Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou, PR China
2. Department of Radiotherapy, The First Affiliated Hospital of Hainan Medical University, Haikou, PR China
3. Department of Radiotherapy, Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya Medical School, Central South University, Changsha, PR China
4. Department of Chemotherapy, Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou, PR China