1. Department of Radiation Oncology State Key Laboratory of Oncology in South China Collaborative Innovation Center for Cancer Medicine Sun Yat‐sen University Cancer Center GuangzhouChina
2. Department of Radiation Oncology The Fifth Affiliated Hospital of Sun Yat‐sen University ZhuhaiChina
3. Department of Nasopharyngeal Carcinoma State Key Laboratory of Oncology in South China Collaborative Innovation Center for Cancer Medicine Sun Yat‐sen University Cancer Center Guangzhou China
4. Department of Medical Statistics and Epidemiology Health Information Research Center Guangdong Key Laboratory of Medicine School of Public Health Sun Yat‐sen University Guangzhou China