1. Vaccine European New Integrated Collaboration Effort (VENICE) Project
2. Health Protection Surveillance Centre, Dublin, Ireland
3. Istituto Superiore di Sanitá, Rome, Italy
4. European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden
5. Institut de Veille Sanitare, Saint-Maurice, France
6. CINECA Consortium of Universities, Bologna, Italy
7. National Institute of Public Health - National Institute of Hygiene, Warsaw, Poland
8. The list of gatekeepers is available at the end of the paper in the acknowledgements section or on the VENICE website: http://venice.cineca.org