1. Department of Infection Control & Preparedness, Norwegian Institute of Public Health, Oslo, Norway
2. Department of Infectious Disease Epidemiology and Prevention, Statens Serum Institut, Copenhagen, Denmark
3. Centre for Infectious Disease Control, National Institute for Public Health and the Environment, Bilthoven The Netherlands
4. Field Service, National Infection Service, Public Health England, Ashford UK
5. Department of Mathematics and Statistics, University of Helsinki, Helsinki, Finland
6. Départment des maladies infectieuses Santé Publique France (French National Public Health Agency), Saint-Maurice, France
7. Communicable Disease Control and Health Protection, Public Health Agency of Sweden, Solna, Sweden
8. Department of Public Health, Global Health Section, University of Copenhagen, Copenhagen, Denmark