1. Research, MSD (UK) Limited, London, UK
2. Department of Health Promotion Sciences, Maternal and Infant Care, Internal Medicine and Excellence Specialties, University of Palermo, Palermo, Italy
3. Translational Pediatrics and Infectious Diseases, Hospital Clínico Universitario de Santiago, Santiago de Compostela, Spain
4. GENVIP Research Group (www.genvip.eu), Instituto de Investigación Sanitaria de Santiago, Universidad de Santiago de Compostela, Santiago de Compostela, Spain
5. Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III, Madrid, Spain
6. Pediatrics, Praxis für Kinder- und Jugendmedizin, Wolfsburg, Germany
7. Research, Merck & Co., Inc., Rahway, NJ, USA
8. Vaccine, MCM Vaccine B.V, Leiden, Netherlands
9. Vaccine, Sanofi Vaccines, Swiftwater, PA, USA