1. National Influenza Center of Cambodia, Virology Unit, Institut Pasteur du Cambodge, Phnom Penh, Cambodia
2. School of Public Health, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong, China
3. HKU-Pasteur Research Pole, School of Public Health, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong, China
4. World Health Organization Collaborating Center, Victorian Infectious Diseases Reference Laboratory, Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
5. World Health Organization Country Office, Phnom Penh, Cambodia
6. U.S. Centers for Disease Control and Prevention, Phnom Penh, Cambodia
7. National Institute of Public Health, Ministry of Health, Phnom Penh, Cambodia
8. Centers for Disease Control and Prevention, Ministry of Health, Phnom Penh, Cambodia