1. Department of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, PR China
2. Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, PR China
3. Department of Health Education, Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, China
4. Department of Immunization Planning, Wuxi Center for Disease Control and Prevention, Wuxi, PR China