1. European Programme for Interventional Epidemiology Training (EPIET), European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden
2. Centre for Infectious Disease Control, Rijksinstituut voor Volksgezondheid en Milieu (National Institute for Public Health and Environment, RIVM), Bilthoven, the Netherlands
3. Municipal Health Service (MHS) “Midden-Nederland”, Zeist, the Netherlands
4. Municipal Health Service (MHS) “Hollands-Midden”, Leiden, the Netherlands
5. Municipal Health Service (MHS), “Zuid-Holland West”, Zoetermeer, the Netherlands