1. HKU-Pasteur Research Pole, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong SAR
2. School of Public Health, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong SAR
3. School of Public Health, Nanjing Medical University, Nanjing, China
4. Department of Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong SAR
5. Department of Pediatrics, University of Alberta, Edmonton, Canada
6. State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
7. Institute of Infectious Disease, Guangzhou Eighth People’s Hospital of Guangzhou Medical University, Guangzhou, China