1. Department of Microbiology, The University of Hong Kong, University Pathology Building, Queen Mary Hospital, Hong Kong Special Administrative Region (S.A.R.), of the People's Republic of China (China).
2. Center for Disease Control and Prevention, Shenzhen, Guangdong Province, China.
3. Department of Pathology, The University of Hong Kong, University Pathology Building, Queen Mary Hospital, Hong Kong S.A.R., China.
4. Government Virus Unit, Department of Health, Hong Kong S.A.R., China.