1. Department of Medical Microbiology & Infection Prevention, Amsterdam University Medical Center, Amsterdam, Netherlands
2. National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam
3. Ha Nam Centre for Disease Control, Ha Nam, Viet Nam
4. Children's Hospital 2, Ho Chi Minh city, Viet Nam
5. Children's Hospital 1, Ho Chi Minh city, Viet Nam
6. Vietnam National Children's Hospital, Hanoi, Viet Nam
7. Siriraj Hospital, Mahidol University, Bangkok, Thailand
8. Hospital for Tropical Diseases, Ho Chi Minh city, Viet Nam
9. National Hospital for Tropical Diseases, Hanoi, Viet Nam
10. Oxford University Clinical Research Unit, Ho Chi Minh city, Viet Nam
11. Radboud Medical Centre, Radboud University, Nijmegen, Netherlands
12. Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
13. Oxford University Clinical Research Unit, Hanoi, Viet Nam
14. Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Australia
15. WHO Collaborating Centre for Reference and Research on Influenza, Melbourne, Australia
16. Centre for Infectious Disease Control, National Institute for Public Health and the Environment, Bilthoven, Netherlands