1. Childhood Leukemia Investigation Prague, Prague, Czech Republic;
2. Department of Pediatric Hematology/Oncology, Charles University, Second Faculty of Medicine, Hospital Motol, Prague, Czech Republic;
3. Dutch Childhood Oncology Group, The Hague, The Netherlands;
4. Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands;
5. Bioinformatics Centre, Second Faculty of Medicine, Charles University, Prague, Czech Republic;
6. University Medical Center, Christian Albrechts University Kiel, Kiel, Germany;
7. Department of Pediatrics, University Medical Center Schleswig Holstein, Campus Kiel, Kiel, Germany;
8. Northern Institute for Cancer Research, Newcastle University, Newcastle upon Tyne, United Kingdom;
9. Department of Pediatric Hematology, Oncology and Transplantology, University of Medical Sciences, Poznan, Poland;
10. Department of Oncology, St. Jude Children’s Research Hospital, Memphis, TN;
11. Nordic Society for Pediatric Hematology and Oncology, Department of Pediatrics and Adolescent Medicine, The Juliane Marie Centre, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark;
12. Institute of Medicine, Faculty of Medicine, University of Copenhagen, Copenhagen, Denmark;
13. Nottingham University Hospitals NHS Trust, Nottingham, United Kingdom;
14. Center of Oncocytogenetics, Institute of Medical Biochemistry and Laboratory Diagnostics, General University Hospital and First Faculty of Medicine, Charles University, Prague, Czech Republic;
15. Immunology and Rheumatology and
16. Hematology and Oncology, Hospital Nacional de Pediatría Prof. Dr. J. P. Garrahan, Buenos Aires, Argentina;
17. Sydney Children’s Hospital Network, Westmead, NSW, Australia;
18. Department of Pediatrics, Medical University of Vienna, St. Anna Children’s Hospital and Children’s Cancer Research Institute, Vienna, Austria;
19. Laboratory of Pediatric Oncohematology, Department of Woman’s and Child’s Health, University of Padova, Padova, Italy;
20. National Program for Antineoplastic Drugs for Children (PINDA), Chilean National Pediatric Oncology Group, Hospital Roberto del Rio/Universidad de Chile, Santiago, Chile;
21. Hospital del Salvador, Universidad de Chile, Santiago, Chile;
22. Pediatric Hematology Oncology, Schneider Children's Medical Center, Petah-Tikva, Israel;
23. Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel;
24. Comenius University Children's Hospital, Bratislava, Slovakia;
25. Center of Children's Oncohematology and BMT, National Children's Specialized Hospital “OHMATDYT,” Kiev, Ukraine;
26. Pediatric Hematology/Oncology, Baylor College of Medicine, Houston, TX;
27. Department of Pediatric Hematology/Oncology, “Aghia Sophia” Children’s Hospital, Athens, Greece;
28. Pediatrics Department, Faculty of Medicine, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil;
29. First Department of Pediatrics, University of Athens, Athens, Greece;
30. Helios Klinikum Berlin Buch, Berlin, Germany;
31. Pediatric Hematology and Oncology, University Children’s Hospital Essen, Essen, Germany; and
32. Department of Pathology, St. Jude Children’s Research Hospital, Memphis, TN