1. European Centre for Disease Prevention and Control, Stockholm, Sweden
2. Institute of Hygiene and Environmental Medicine, Charité – University Medicine Berlin, Berlin, Germany
3. Public Health England, London, United Kingdom
4. National Institute for Health and Welfare (THL), Department of Health Security, Helsinki, Finland
5. Agenzia sanitaria e sociale regionale – Regione Emilia Romagna, Bologna, Italy
6. Glasgow Caledonian University, Glasgow, United Kingdom
7. National Services Scotland, Health Protection Scotland, Glasgow, United Kingdom
8. Mater Dei Hospital, Msida, Malta
9. Imperial College, London, United Kingdom