1. State Key Laboratory of Oncology in South China, Guangzhou, China
2. Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, China
3. Guangdong Provincial Clinical Research Center for Cancer, Guangzhou, China
4. Sun Yat-sen University Cancer Center, Guangzhou, China
5. Department of Biostatistics, School of Public Health, Southern Medical University, Guangzhou, China
6. Nasopharyngeal Cancer Center, the Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, China