1. Department of Paediatrics, The Chinese University of Hong Kong, Prince of Wales Hospital , Hong Kong, China
2. Hong Kong Hub of Paediatric Excellence, The Chinese University of Hong Kong , Hong Kong, China
3. The Chinese University of Hong Kong-University Medical Center Utrecht Joint Research Laboratory of Respiratory Virus and Immunobiology, The Chinese University of Hong Kong , Hong Kong, China
4. Department of Microbiology, The Chinese University of Hong Kong, Prince of Wales Hospital , Hong Kong, China