1. Department of Pediatrics and Adolescent Medicine; University Hospital Rigshospitalet; Copenhagen Denmark
2. Department of Clinical Immunology; University Hospital Rigshospitalet; Copenhagen Denmark
3. Department of Pediatrics; Institution of Clinical Sciences; Sahlgrenska University Hospital; Gothenburg Sweden
4. Department of Pediatrics; Aarhus University Hospital; Aarhus Denmark
5. Department of Clinical Genetics; University Hospital Rigshospitalet; Copenhagen Denmark
6. Department of Pediatrics; Astrid Lindgrens Hospital; Stockholm Sweden
7. Department of Pediatrics; Skåne University Hospital; Lund Sweden
8. Department of Pediatrics; Oslo University Hospital; Norway
9. Centre for Pediatric Oncology and Hematology; University Children's Hospital; Vilnius Lithuania
10. Department of Pediatrics; Turku University Hospital; Turku Finland
11. Department of Pediatrics; Oulu University Hospital; Oulu Finland
12. Children and Adolescents; Helsinki University Hospital; Helsinki Finland
13. Institute of Clinical Medicine, Faculty of Health and Medical Sciences; University of Copenhagen; Denmark
14. Division of Pediatric Hematology/Oncology, Perlmutter Cancer Center; NYU Langone Medical Center; New York