| Affiliation: | 1. H?pital Necker‐Enfants Malades, Service de Pédiatrie, Paris, France;2. Correspondence to: M. De Montalembert, H?pital Necker‐Enfants Malades, Service de Pédiatrie, 149 rue de Sèvres, Paris 75015, France.;3. E‐mail:;4. Department of Pediatrics and Adolescent Medicine, American University of Beirut, Beirut, Lebanon;5. Vaccine Research, Pfizer Ltd, Tadworth, Berkshire, UK;6. RHUH, Rafic Hariri University Hospital, Beirut, Lebanon;7. University of Alabama at Birmingham, Birmingham, Alabama;8. Pediatric Cairo University Hospital (Abu Elreesh ‐ Almoneera), Egypt;9. Hematology unit, Children Hospital, Ain Shams University, Cairo, Egypt;10. Ospedale San Luigi Gonzaga, Orbassano, Torino University, Italy;11. Vanderbilt University Medical Center, Nashville, Tennessee;12. Evelina Children's Hospital, St Thomas' Hospital, London, UK;13. King's College Hospital, London, UK;14. Vaccine Institute, St Georges, University of London, London, UK;15. Royal London Hospital, London, UK;16. Children's Hospital at Montefiore, Bronx, New York;17. King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia;18. Unità Operativa di Epidemiologia Ospedale Bambino Gesù, Roma, Italy;19. Vaccines, Pfizer Inc, Collegeville, Pennsylvania;20. Vaccine Research, Pfizer Inc, Pearl River, New York |
