1. Department of Radiation Oncology; Cancer Center of Guangzhou Medical University; Guangzhou China
2. Department of Radiation Oncology; Hui Zhou Municipal Central Hospital; Guangzhou China
3. Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Guangdong Province People's Republic of China
4. Department of Radiation Oncology; Jiangxi Cancer Hospital; Nanchang Jiangxi China
5. Department of Medical Oncology; Hui Zhou Municipal Central Hospital; Guangzhou China