1. European Programme for Intervention Epidemiology Training (EPIET), European Centre for Disease Prevention and Control, Stockholm, Sweden
2. Department of Epidemiology, Scientific Institute of Public Health, Brussels, Belgium
3. National Reference Laboratory for Influenza, Scientific Institute of Public Health, Brussels, Belgium
4. Department of Public Health Surveillance, Agency for Care and Health, Flemish Community, Brussels, Belgium
5. Health Inspectorate, Brussels Region, Brussels, Belgium
6. Health Inspectorate. Health Surveillance, French Community, Brussels, Belgium