1. Department of Clinical Sciences and Paediatrics Lund University Lund Sweden
2. Department for Paediatric Haematology and Oncology Skåne University Hospital Lund Sweden
3. Hans Christian Andersen Children's Hospital, Odense University Hospital Odense Denmark
4. Department of Hematology University Hospital of Aarhus Aarhus Denmark
5. Department of Paediatric Haematology and Oncology Oslo University Hospital Rikshospitalet Norway
6. Department of Pediatric Hematology/Oncology University Hospital Copenhagen Copenhagen Denmark
7. Department of Pediatric and Adolescent Medicine Turku University Hospital, FICAN‐West, and Turku University Turku Finland
8. Department of Haematology Karolinska University Hospital Stockholm Sweden
9. Paediatrics and Adolescent Medicine, Aarhus University Hospital and Department of Clinical Medicine Aarhus University Aarhus Denmark
10. Tampere Center for Child, Adolescent, and Maternal Health Research, Faculty of Medicine and Health Technology, Tampere University and Tays Cancer Center Tampere University Hospital Tampere Finland
11. New Children's Hospital and Helsinki University Central Hospital, University of Helsinki, Division of Hematology‐Oncology and Stem Cell Transplantation Helsinki Finland
12. Hematology Department University Hospital Copenhagen Copenhagen Denmark
13. Clinic of Children's Diseases, Faculty of Medicine Vilnius University, Vilnius University Hospital Santaros Klinikos Vilnius Lithuania
14. Unit of Pediatric Hematology Kuopio University Hospital Kuopio Finland
15. Division of Pediatric Hematology‐Oncology B153, Department of Biomedical and Clinical Sciences Crown Princess Victoria's Children's and Youth Hospital, Linköping University Linköping Sweden
16. Department of Women's and Children's Health Karolinska Institutet and Astrid Lindgren Children's Hospital, Karolinska University Hospital Stockholm Sweden