1. Genetics, Vaccines and Pediatric Infectious Diseases Research Group (GENVIP, Instituto De Investigación Sanitaria De Santiago and Universidad De Santiago De Compostela (Usc), Santiago de Compostela, Galicia, Spain
2. Institut Pasteur, Invasive Bacterial Infections Unit, National Reference Centre for Meningococci and Haemophilus Influenza, Paris, France
3. Klinik Für Kinder- Und Jugendmedizin, Worms, Germany and Pediatric Infectious Diseases, University Medicine, Mainz, Germany
4. GSK, Amsterdam, The Netherlands
5. GSK, Siena, Italy
6. GSK, Rockville, MD, United States
7. GSK, Rueil-Malmaison, France