1. Hematology Laboratory, Purpan Hospital, Toulouse, France;
2. European Organisation for Research and Treatment of Cancer Headquarters, Brussels, Belgium;
3. Department of Hematology, Children’s Hospital, Toulouse, France;
4. Center for Medical Genetics, Universiteit Ziekenhuis, Ghent, Belgium;
5. Department of Genetics, Assistance Publique-Hôpitaux de Paris, Hôpital Robert Debré, Paris, France;
6. Paris-Diderot University, Paris, France;
7. Hematology Laboratory, Lyon Sud Hospital, Lyon, France;
8. Molecular Hematology Laboratory, UZ Brussels, Brussels, Belgium;
9. Department of Hemato-Immunology, Robert Debré Hospital, Paris, France;
10. University Lille Nord de France and Pediatric Hematology Unit, Centre Hospitalier Universitaire, Lille, France;
11. Department of Pediatric Hematology and Oncology, University Hospitals Leuven, Leuven, Belgium;
12. Hematology Laboratory, Hautepierre, Strasbourg, France;
13. Department of Pediatric Hematology, Hautepierre, Strasbourg, France;
14. Department of Genetics, Portuguese Oncology Institute, Porto and Biomedical Sciences Institute, University of Porto, Porto, Portugal;
15. Laboratory of Cytogenetics, Bordet Institute, Brussels, Belgium;
16. Department of Hemato-Oncology, Hôpital Universitaire des Enfants Reine Fabiola, Brussels, Belgium;
17. Department of Pediatric Hematology-Oncology, Centre Hospitalier Universitaire, Besançon, France;
18. Department of Genetics, Centre Hospitalier Universitaire, Besançon, France;
19. Department of Pediatric Hematology-Oncology and
20. Hematology Laboratory, Centre Hospitalier Universitaire, Reims, France;
21. Department of Pediatric Hematology-Oncology, Centre Hospitalier Universitaire, Caen, France;
22. Department of Pediatric Hematology-Oncology, Centre Hospitalier Universitaire, Nice, France;
23. Department of Immuno-Hemato-Pediatrics, Hospices Civils de Lyon et Université Claude Bernard, Lyon, France; and
24. Department of Pediatric Hematology-Oncology, Ghent University Hospital, Ghent, Belgium