1. Pan American Health Organization, 525 23rd Street NW, Washington, DC, 20037, United States of America (USA).
2. Centers for Disease Control and Prevention, Atlanta, USA.
3. Institute of Mathematics and Statistics, University of São Paulo, São Paulo, Brazil.
4. Ministry of Health, Brasília, Brazil.
5. Ministry of Health, Buenos Aires, Argentina.
6. Ministry of Health, Santiago, Chile.
7. Ministry of Health, Mexico City, Mexico.
8. Global Influenza Programme, World Health Organization, Geneva, Switzerland.