1. Department of Radiation Oncology, National University Cancer Institute, National University Hospital, Singapore 119074, Singapore
2. Department of Nasopharyngeal Carcinoma, Sun Yat-sen University Cancer Center, Guangzhou 510060, China
3. State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou 510060, China
4. Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou 510060, China
5. Cooperative Surgical Ward of Nasopharyngeal Carcinoma, Faifth Affiliated Hospital of Guangzhou Medical University, Guangzhou 510700, China
6. Division of Medical Sciences, National Cancer Centre Singapore, 30 Hospital Blvd, Singapore 168583, Singapore
7. Division of Radiation Oncology, National Cancer Centre Singapore, 30 Hospital Blvd, Singapore 168583, Singapore
8. Oncology Academic Clinical Programme, Duke-NUS Medical School, Singapore 169857, Singapore