1. Institute of Infectious Disease and Vaccine, School of Public Health, Zhejiang Chinese Medical University, Hangzhou, China
2. National Institute of Pathogen Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
3. National Immunization Program, Chinese Center for Disease Control and Prevention, Beijing, China
4. School of Public Health (Shenzhen), Sun Yat-sen University, Shenzhen, China