1. Public Health Microbiology, National Meningitis Reference Laboratory, Laboratory for Surveillance of Infectious Diseases, Department of Public Health Policy, School of Public Health, University of West Attica, Athens, Greece
2. Center of children vaccination in Thomayer University Hospital, and Department of Pediatrics, First Faculty of Medicine, Charles University Prague, Prague, Czech Republic
3. Serbian Reference Laboratory, Sombor, Serbia
4. National Institute for Infectious Diseases “Prof.Dr.Matei Bals”, Faculty of Medicine, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania
5. Department of Pediatrics, Immunology, Infectious and Rare Diseases, European Medical School of the International European University, Kyiv, Ukraine
6. Pediatric Department of County Hospital, Miskolc, Hungary
7. Division of Paediatrics, University Medical Centre Ljubljana, Ljubljana, Slovenia
8. National Reference Centre for Bacterial Meningitis, Department of Epidemiology and Clinical Microbiology, National Medicines Institute, Warsaw, Poland
9. University of Zagreb, and Pediatric Infectious Diseases Department, University Hospital for Infectious Diseases, Zagreb, Croatia