1. Department of Immunization Planning, Luohu District Center for Disease Control and Prevention, Shenzhen, China
2. Institute of Immunization Programme, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou, Guangdong, China
3. Institute of Pathogenic Microbiology, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou, Guangdong, China
4. Institute of Pathogenic Microbiology, Guangdong Provincial Key Laboratory of Pathogen Detection for Emerging Infectious Disease Response, China
5. School of Public Health, Sun Yat-sen University, Guangzhou, China