1. Department of National Immunization Program, Chinese Center for Disease Control and Prevention, Beijing, China
2. Department of Expanded Program on Immunization, Hangzhou Center for Disease Control and Prevention, Hangzhou, China
3. Chinese Epidemiology Training Program, Chinese Center for Disease Control and Prevention, Beijing, China
4. Department of Expanded Program on Immunization, Anhui Center for Disease Control and Prevention, Hefei, China
5. Department of Expanded Program on Immunization, Fuzhou Center for Disease Control and Prevention, Fuzhou, China
6. Department of Expanded Program on Immunization, Lu'an Center for Disease Control and Prevention, Lu'an, China