1. Astrid Lindgren Children’s Hospital Karolinska University Hospital StockholmSweden
2. Department of Women’s and Children’s Health Karolinska Institutet Stockholm Sweden
3. Children’s Hospital Landspitali University Hospital Reykjavik Iceland
4. Department of Pediatrics and Adolescent Medicine University Hospital Rigshospitalet CopenhagenDenmark
5. Institute of Clinical Medicine Faculty of Medicine University of Copenhagen Denmark
6. PEDEGO Research Unit Medical Research Center Oulu and Department of Children and Adolescents Oulu University Hospital and University of Oulu Oulu Finland
7. Department of Paediatrics and Adolescent Medicine Aarhus University Hospital AarhusDenmark
8. Department of Clinical Medicine Aarhus University Aarhus Denmark
9. Department of Paediatrics University Hospital of North Norway Tromsø Norway
10. Children’s Hospital Affiliate of Vilnius University Hospital Santaros Klinikos and Vilnius University Vilnius Lithuania
11. Department of Haematology and Oncology Children's hospital Tallinn Estonia
12. Department of Women's and Children's Health Uppsala University Uppsala Sweden