1. Laboratory of Medical Microbiology, Vaccine and Infectious Disease Institute, University of Antwerp, Wilrijk, Belgium
2. Centre for the Evaluation of Vaccination, Vaccine and Infectious Disease Institute, University of Antwerp, Wilrijk, Belgium
3. Laboratory of Clinical Microbiology, Antwerp University Hospital, Edegem, Belgium
4. Reference Centre for Pneumococci, University Hospitals Leuven, Leuven, Belgium
5. Centre for Health Economics Research and Modelling Infectious Diseases, University of Antwerp, Wilrijk, Belgium