1. National Institute for Biological Standards and Control, Potters Bar, United Kingdom
2. Sanofi Pasteur, Swiftwater, Pennsylvania, USA
3. Biomedical Primate Research Centre, Rijswijk, The Netherlands
4. Quinten, Paris, France
5. Influenza Centre, Department of Clinical Sciences, University of Bergen, Bergen, Norway
6. Public Health England, Colindale, United Kingdom
7. GSK, Wavre, Belgium
8. University of Siena, Department of Molecular and Developmental Medicine, Siena, Italy