1. School of Public Health, LKS Faculty of Medicine The University of Hong Kong Hong Kong China
2. Department of Pediatrics, Faculty of Medicine The Chinese University of Hong Kong Hong Kong China
3. Jockey Club School of Public Health and Primary Care, Faculty of Medicine The Chinese University of Hong Kong Hong Kong China
4. Stanley Ho Centre for Emerging Infectious Diseases The Chinese University of Hong Kong Hong Kong China
5. Shenzhen Research Institute of the Chinese University of Hong Kong Shenzhen China
6. School of Public Health and Health Policy City University of New York New York NY USA