1. Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China, 510515
2. Department of Radiation Oncology, Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou, Guangdong Province, People’s Republic of China, 510095
3. Department of Radiation Oncology, Shenzhen People’s Hospital, Second Clinical Medicine College of Jinan University, China, 518020