1 Yunnan Key Laboratory of Vaccine Research and Development on Severe Infectious Diseases, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, China
2 Guangxi Province Centres for Disease Control and Prevention, Nanning, China
3 National Institutes for Food and Drug Control, Beijing, China
4 Departments of Biomedical Science and Pathology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
5 Institute of Health & Community Medicine, University Malaysia Sarawak, Kuala Lumpur, Malaysia
6 Key Laboratory of Medical Molecular Virology, Ministries of Education and Health, Institute of Biological Sciences, Shanghai Medical College, Fudan University, Shanghai, China
7 Department of Health Statistics, Fourth Military Medical University, Xi'an, China
8 National Institutes for Food and Drug Control, Beijing, China. wangjz@nicpbp.org.cn
9 Yunnan Key Laboratory of Vaccine Research and Development on Severe Infectious Diseases, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, China. liqihan@imbcams.com.cn