1. Department of Radiation Oncology, Sun Yat-Sen University Cancer Center, Guangzhou, China
2. State Key Laboratory of Oncology in South China, Guangzhou, China
3. Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
4. Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, China
5. Department of Radiation Oncology, Wuzhou Red Cross Hospital, Wuzhou, China
6. Division of Clinical Trials and Epidemiological Sciences, National Cancer Centre Singapore, Singapore
7. Oncology Academic Programme, Duke-NUS Medical School, Singapore
8. Division of Radiation Oncology, National Cancer Centre Singapore, Singapore
9. Division of Medical Sciences, National Cancer Centre Singapore, Singapore
10. Division of Radiation Oncology, Department of Head and Neck and Thoracic Cancers, National Cancer Centre Singapore, 11 Hospital Crescent, Singapore 169610
11. Department of Radiation Oncology, Sun Yat-Sen University Cancer Center, No. 651 Dongfeng Eastern Road, Guangzhou 510060, Guangdong, China
12. State Key Laboratory of Oncology in South China Guangzhou, China