1. Astrid Lindgren Children's Hospital Karolinska University Hospital Stockholm Sweden
2. Department of Women's and Children's Health, Childhood Cancer Research Unit Karolinska Institutet Stockholm Sweden
3. Department of Women's and Children's Health Uppsala University Uppsala Sweden
4. Department of Pediatrics and Adolescent Medicine University Hospital Rigshospitalet Copenhagen Denmark
5. Department of Women's and Children's Health, Neuropediatric Unit Karolinska Institutet Stockholm Sweden
6. Department of Pediatric Hematology/Oncology Oslo University Hospital Oslo Norway
7. Department of Clinical Immunology Rigshospitalet University of Copenhagen Copenhagen Denmark
8. Department of Children and Adolescents Oulu University Hospital and University of Oulu, PEDEGO Research Unit Oulu Finland
9. Childhood Cancer Centre Skåne University Hospital Lund Sweden
10. Institute of Clinical Medicine Faculty of Medicine University of Copenhagen Copenhagen Denmark
11. Children's Hospital Affiliate of Vilnius University Hospital Santaros Klinikos and Vilnius University Vilnius Lithuania