1. National Institute for Public Health and the Environment, Center for Infectious Disease Control, Bilthoven, the Netherlands
2. National Reference Centre for Enteric Viruses, Dijon, France
3. Health Protection Surveillance Centre, Dublin, Ireland
4. Municipal Health Service West-Brabant, Breda, the Netherlands
5. Direction Départementale des Affaires Sanitaires et Sociales (District Health and Social Services, DDASS) des Haute Pyrénées, France
6. Institut de Veille Sanitaire (French Institute for Public Health Surveillance, INVS), Saint Maurice, France