1. Department of Paediatrics; Aarhus University Hospital Skejby; Aarhus Denmark
2. Cancer Cytogenetics Laboratory; Department of Haematology Aarhus University Hospital; Aarhus Denmark
3. Institution for Clinical Sciences; Department of Paediatrics; Queen Silvia Children's Hospital; Gothenburg Sweden
4. Department of Paediatrics; Queen Mary Hospital and Hong Kong Paediatric Haematology & Oncology Study Group (HKPHOSG); Hong Kong China
5. Department of Paediatrics; University Hospital; Lund Sweden
6. Children's Hospital; University of Helsinki and Helsinki University Hospital; Helsinki Finland
7. Department of Paediatrics; Landspitalinn; Reykjavik Iceland
8. Department of Paediatrics and Adolescent Medicine; Rigshospitalet; University of Copenhagen; Copenhagen Denmark
9. Department of Women′s and Children′s Health; Uppsala University; Uppsala Sweden
10. Department of Paediatric Medicine; Oslo University Hospital; Oslo Norway
11. Department of Medical Biosciences; Clinical Genetics; Umeå University Hospital; Umeå Sweden