1 State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine; Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Sun Yat-sen University Cancer Center, Guangzhou, Guangdong, 510060, P. R. China.
2 School of Public Health, The University of Hong Kong, Hong Kong S.A.R., 999077, P. R. China.
3 Center for Nasopharyngeal Carcinoma Research, Research Grants Council Area of Excellence Scheme, The University of Hong Kong, Hong Kong S.A.R., 999077, P. R. China.
4 Radiation Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA.
5 School of Public Health, Sun Yat-sen University, Guangzhou, Guangdong, 510080, P. R. China.
6 Wuzhou Red Cross Hospital, Wuzhou, Guangxi, 543002, P. R. China.
7 Wuzhou Cancer Center, Wuzhou, Guangxi, 543002, P. R. China.
8 Center for Health Sciences, Exponent, Inc., Menlo Park, CA, 94025, Department of Epidemiology and Biostatistics, University of California, San Francisco, CA, 94143, USA.
9 Department of Otolaryngology-Head and Neck Surgery, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, 530021, P. R. China.
10 Department of Radiation Oncology, Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine; Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, Guangdong, 510060, P. R. China.
11 Department of Clinical Oncology, The University of Hong Kong, Hong Kong S.A.R., 999077, P. R. China.
12 Clinical Effectiveness Group, Institute of Health and Society, University of Oslo, Oslo, 0316, Norway.
13 Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, 17177, Sweden.
14 Department of Epidemiology and Health Statistics & Key Laboratory of Ministry of Education for Gastrointestinal Cancer, Fujian Medical University, Fuzhou, Fujian, 350122, P. R. China.