1. Department of Clinical Oncology; The University of Hong Kong; Pokfulam, Hong Kong
2. State Key Laboratory of Oncology in Southern China; Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center; Guangzhou China
3. Department of Epidemiology, Cancer Prevention Center; State Key Laboratory of Oncology in Southern China, Sun Yat-sen University Cancer Center; Guangzhou China
4. Department of Nasopharyngeal Carcinoma; Sun Yat-Sen University Cancer Center; Guangzhou China