1. Service de Pédiatrie, Université de Paris VII Diderot, Paris, France
2. Invasive Bacterial Infections Unit, Institut Pasteur, Paris, France
3. RWE department, CEMKA, Bourg-la-Reine, France
4. Vaccines, GSK, Rueil-Malmaison, France
5. Vaccines, GSK, Wavre, Belgium