1. Department of Pediatrics and Adolescent Medicine; the Juliane Marie Center; University Hospital Rigshospitalet; Copenhagen Denmark
2. Childhood Cancer Research Unit; Department of Women's and Children's Health; Karolinska Institutet; Stockholm Sweden
3. Department of Molecular Medicine and Surgery and Center for Molecular Medicine; Karolinska Institutet; Stockholm Sweden
4. Department of Clinical Genetics; Karolinska University Hospital; Stockholm Sweden
5. Department of Children and Adolescents; Oulu University Hospital; Oulu Finland
6. PEDEGO Research Unit; University of Oulu; Oulu Finland
7. Department of Pediatric Oncology and Hematology; Division of Pediatric and Adolescent Medicine; Oslo University Hospital; Oslo Norway
8. Children's Hospital; Landspitali University Hospital; Reykjavik Iceland
9. Department of Hematology; Oncology, and Transfusion Medicine Center; Vilnius University Hospital Santariskiu Klinikos; Vilnius Lithuania
10. Faculty of Medicine; Vilnius University; Vilnius Lithuania
11. Department of Hematology Oncology; Tallinn Children´s Hospital; Tallinn Estonia
12. Department of Medical Sciences; Uppsala University; Uppsala Sweden
13. Department of Orthopedic Surgery; University Hospital Herlev Gentofte; Copenhagen Denmark
14. Department of Hematology; University Hospital Rigshospitalet; Copenhagen Denmark
15. Institute of Clinical Medicine; Faculty of Medicine; University of Copenhagen; Copenhagen Denmark