1. National Immunization Program, Chinese Center for Disease Control and Prevention, Beijing, China
2. National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, Chinese Center for Disease Control and Prevention, Beijing, China
3. Department of National Immunization Programe, Fujian Provincial Center for Disease Control and Prevention, Fuzhou, China
4. Department of National Immunization Programe, Henan Provincial Center for Disease Control and Prevention, Zhengzhou, China
5. Department of National Immunization Programe, Sichuan Provincial Center for Disease Control and Prevention, Chengdu, China
6. Department of National Immunization Programe, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou, China
7. Department of National Immunization Programe, Gansu Provincial Center for Disease Control and Prevention, Lanzhou, China
8. Department of National Immunization Programe, Hubei Provincial Center for Disease Control and Prevention, Wuhan, China