1. European Centre for Disease Prevention and Control, Solna, Sweden
2. Sciensano, Brussels, Belgium
3. Agenzia sanitaria e sociale regionale – Regione Emilia Romagna, Bologna, Italy
4. Public Health England, London, United Kingdom
5. Institute of Hygiene and Environmental Medicine, Charité – University Medicine Berlin, Berlin, Germany
6. National Institute for Health and Welfare, Department of Health Security, Helsinki, Finland
7. Glasgow Caledonian University, Glasgow, United Kingdom
8. National Services Scotland, Health Protection Scotland, Glasgow, United Kingdom
9. Department of Propaedeutics of Medicine, Nicolaus Copernicus University, Toruń; Ludwik Rydygier Collegium Medicum; Bydgoszcz, Poland
10. Imperial College London, London, United Kingdom