1. Statens Serum Institut, Copenhagen, Denmark
2. The National Board of Health and Welfare, Stockholm, Sweden
3. Scientific Institute of Public Health, Brussels, Belgium
4. National Institute for Health and Welfare, Helsinki, Finland
5. French Institute for Public Health Surveillance (Institut de Veille Sanitaire, InVS), Saint-Maurice, France
6. Hesse State Health Office, Dillenburg, Germany
7. Hellenic Centre for Disease Control and Prevention, Athens, Greece
8. Hungary National Institute of Environmental Health, Budapest, Hungary
9. Health Protection Surveillance Centre, Dublin, Ireland
10. Instituto Nacional de Saúde Dr. Ricardo Jorge, Lisbon, Portugal
11. Instituto de Salud Carlos III, Madrid, Spain
12. Federal Statistical Office, Neuchâtel, Switzerland
13. National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands
14. Health Protection Agency, Colindale, United Kingdom