1. State Key Laboratory for Emerging Infectious Diseases, The University of Hong Kong, Hong Kong Special Administrative Region, China
2. Research Centre of Infection and Immunology, The University of Hong Kong, Hong Kong Special Administrative Region, China
3. Department of Microbiology, The University of Hong Kong, Hong Kong Special Administrative Region, China
4. Department of Pathology, Tuen Mun Hospital, Hong Kong Special Administrative Region, China
5. Department of Medicine and Geriatrics, Princess Margaret Hospital, Hong Kong Special Administrative Region, China