1. Department of Immunization Programe, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou, China
2. Department of Epidemiology, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu, China
3. NHC Key Laboratory of Enteric Pathogenic Microbiology (Jiangsu Provincial Center for Disease Control and Prevention), Nanjing, China
4. Institute of Global Public Health and Emergency Pharmacy, China Pharmaceutical University, Nanjing, China