1. Nordic Research Network Oy, Tampere, Finland
2. Health Care Establishment in Debica, Infectious Diseases Outpatient Clinic, Debica, Poland
3. Vaccine Research Center, Tampere University, Tampere, Finland
4. Tampere University and Tampere University Hospital, Tampere, Finland
5. Department of Pediatric Infectious Diseases, Medical University of Lodz, Lodz, Poland
6. Department of Pediatric Infectious Diseases, Wroclaw Medical University, Wroclaw, Poland
7. Coastal Pediatric Research, Charleston, SC, USA
8. Department of Pediatrics, The Medical Centre of Postgraduate Education, Warsaw, Poland
9. Optimal Research LLC, Melbourne, FL, USA
10. Gsk, Siena, Italy
11. Gsk, Amsterdam, The Netherlands