1. Department of Paediatrics and Adolescent Medicine Hong Kong Children's Hospital Kowloon Hong Kong
2. Department of Paediatrics, Faculty of Medicine The Chinese University of Hong Kong New Territories Hong Kong
3. Hong Kong Hub of Paediatric Excellence The Chinese University of Hong Kong New Territories Hong Kong
4. Laboratory for Paediatric Respiratory Research, Li Ka Shing Institute of Health Sciences, Faculty of Medicine The Chinese University of Hong Kong New Territories Hong Kong
5. CUHK‐UMCU Joint Research Laboratory of Respiratory Virus & Immunobiology, Department of Paediatrics, Faculty of Medicine The Chinese University of Hong Kong New Territories Hong Kong