1. Department of Pediatrics; Aarhus University Hospital; Skejby, Aarhus Denmark
2. Department of Hematology; Cancer Cytogenetics Laboratory; Aarhus University Hospital; Tage Hansens Gade, Aarhus Denmark
3. Department of Pediatrics; Institution for Clinical Sciences, 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 Pediatrics; University Hospital; Lund Sweden
6. Children's Hospital, Helsinki University Central Hospital; Helsinki Finland
7. University of Helsinki; Helsinki Finland
8. Department of Pediatrics; Landspitalinn Reykjavik Iceland
9. Department of Pediatrics and Adolescent Medicine; Rigshospitalet, University of Copenhagen; Copenhagen Denmark
10. Department of Woman's and Children's Health; Uppsala University; Uppsala Sweden
11. Department of Pediatric Medicine; Oslo University Hospital; Oslo Norway
12. Department of Medical Biosciences; Clinical Genetics, Umeå University Hospital; Umeå Sweden