1. New Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
2. Department of Women’s and Children’s Health, Karolinska Institutet, Stockholm, Sweden
3. Astrid Lindgren Children’s Hospital, Karolinska University Hospital, Stockholm, Sweden
4. Department of Intensive Care for Newborns and Infants, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
5. Neisseria and Streptococcus Reference Laboratory, Department of Bacteria, Parasites & Fungi, Statens Serum Institut, Copenhagen, Denmark
6. Department of Clinical Science/Paediatrics, Umeå University, Umeå, Sweden
7. University of Iceland, Faculty of Medicine, Reykjavik, Iceland
8. Children’s Hospital Iceland, Landspitali University Hospital, Reykjavik, Iceland
9. Department of Neonatal Intensive Care, Clinic of Paediatric and Adolescent Medicine, Oslo University Hospital, Oslo, Norway
10. Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, Children’s Clinic, St. Olavs University Hospital, Trondheim, Norway
11. Research Service Unit, Oulu University Hospital, Oulu, Finland
12. Department of Paediatrics and Adolescent Medicine, Oulu University Hospital, Oulu, Finland
13. Biocenter Oulu and Research Unit of Clinical Medicine, University of Oulu, Oulu, Finland