1. World Health Organization Collaborating Centre for Infectious Disease Epidemiology and Control, School of Public Health, China
2. HKU-Pasteur Research Pole, School of Public Health, China
3. Centre for Influenza Research, Li Ka Shing Faculty of Medicine, University of Hong Kong, China
4. Department of Family Medicine and Primary Healthcare, Queen Mary Hospital, Hospital Authority, Hong Kong Special Administrative Region, China
5. World Health Organization Collaborating Centre for Reference and Research
6. Department of Microbiology and Immunology, University of Melbourne, Victoria, Australia