1. Vaccine Medical Development, Scientific and Clinical Affairs, Pfizer Ltd, Tadworth, UK
2. Meningococcal Reference Unit, Public Health England, Manchester Royal Infirmary, Manchester, UK
3. Woodruff Health Sciences Center, Emory University, Atlanta, GA, USA
4. Vaccine Research and Development, Pfizer Inc, Pearl River, NY, USA
5. Vaccine Medical Development, Scientific and Clinical Affairs, Pfizer Inc, Collegeville, PA, USA