1. Department of Pediatric Hematology/Oncology, Medical School Hannover, Hannover, Germany;
2. Department of Pediatric Oncology/Hematology, Erasmus MC-Sophia Children's Hospital, Rotterdam, The Netherlands;
3. Department of Haematology, Royal Hospital for Sick Children, Glasgow, United Kingdom;
4. St Anna Children's Hospital and Children's Cancer Research Institute, Department of Pediatrics, Medical University of Vienna, Vienna, Austria;
5. Department of Human Health Sciences, Kyoto University Graduate School of Medicine, Kyoto, Japan;
6. Department of Pediatrics, Division of Pediatric Oncology/Hematology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands;
7. Oncogenetic Laboratory, Department of Pediatric Hematology and Oncology, Justus-Liebig-University, Giessen, Germany;
8. Department of Pediatrics, Aarhus University Hospital Skejby, Aarhus, Denmark;
9. Division of Hematology/Oncology, Children's Hospital of Eastern Ontario, Ottawa, ON;
10. Department of Pediatrics, St Marianna University School of Medicine, Kawasaki, Japan;
11. Pediatric Hematology and Oncology, University of Frankfurt, Frankfurt, Germany;
12. Department of Haemato-Immuno-Oncology, Trousseau Hospital, Assistance Publique–Hôpitaux de Paris, University Paris VII, France;
13. Childhood Leukaemia Investigation Prague, Department of Paediatric Haematology and Oncology, Charles University Prague, 2nd Medical School, Prague, Czech Republic;
14. Division of Pediatric Hematology/Oncology, University of Washington School of Medicine, Seattle, WA and Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA;
15. Pediatric Oncology and Hematology Lalla Seràgnoli Unit, University of Bologna, Bologna, Italy;
16. Department of Pathology, St Jude Children's Research Hospital, Memphis, TN;
17. Division of Haematology/Oncology, Hospital for Sick Children, Toronto, ON;
18. Department of Pediatric Hematology and Oncology, Charles University Prague, and Czech Pediatric Hematology Working Group (CPH), Prague, Czech Republic; and
19. Department of Pediatric Oncology/Hematology, VU University Medical Center, Amsterdam, The Netherlands