1. Department of Vaccination Clinic, Shenzhen Longhua District Maternity and Child Healthcare Hospital, Shenzhen, China
2. Centre for Health Behaviours Research, JC School of Public Health and Primary Care, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China
3. Department of Children’s Group Health, Shenzhen Futian District Maternity and Child Healthcare Hospital, Shenzhen, China
4. Department of Epidemiology and Infectious Disease Control, Longhua Key Discipline of Public Health for the Prevention and Control of Infectious Diseases, Longhua Centre for Disease Control and Prevention, Shenzhen, China
5. Department of Health and Physical Education, the Education University of Hong Kong, Hong Kong SAR, China