1. Department of Microbiology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong, China
2. State Key Laboratory of Respiratory Disease, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
3. State Key Laboratory of Emerging Infectious Diseases, The University of Hong Kong, Hong Kong, China
4. Centre for Virology, Vaccinology and Therapeutics, Hong Kong Science and Technology Park, Hong Kong, China
5. Carol Yu Centre for Infection, The University of Hong Kong, Pokfulam, Hong Kong, China