1. Division of Haematology/Oncology, Department of Paediatrics, The Hospital for Sick Children, Toronto, ON, Canada;
2. Dana-Farber Cancer Institute, Boston, MA;
3. Department of Pathology, Children’s Hospital of Pittsburgh of UPMC, University of Pittsburgh School of Medicine, Pittsburgh, PA;
4. Pediatric Oncology Clinic, Faculty of Medicine, Masaryk University, Brno, Czech Republic;
5. Department of Pathology, University Hospital, Brno, Czech Republic;
6. Department of Pathology, Magee Women’s Hospital of UPMC, University of Pittsburgh School of Medicine, Pittsburgh, PA;
7. Pathology Department, Ambroise Paré Hospital, Assistance Publique–Hôpitaux de Paris (AP-HP), Boulogne, France;
8. Research Unit EA4340, Versailles SQY University, Paris-Saclay University, Boulogne, France;
9. Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY;
10. Department of Hematology, Oncology, Hospital de Pediatría JP Garrahan, Buenos Aires, Argentina;
11. Department of Pathology, Pitié-Salpêtrière Hospital, AP-HP, Paris, France;
12. Department of Internal Medicine, Paris VI University, Université Pierre et Marie Curie, Sorbonne Universités, Paris, France;
13. Department of Haematology, AP-HP, Trousseau Hospital, Paris, France;
14. Department of Internal Medicine 2, French National Centre for Rare Systemic Diseases, Pitié-Salpêtrière Hospital, AP-HP, Paris, France;
15. St. Jude Children’s Research Hospital, Memphis, TN;
16. Section of Hematology-Oncology, Department of Pediatrics, Baylor College of Medicine, Houston, TX;
17. Texas Children’s Cancer Center, Texas Children’s Hospital, Houston, TX;
18. Program in Translational Biology and Molecular Medicine, Baylor College of Medicine, Houston, TX;
19. Department of Neurology, Memorial Sloan Kettering Cancer Center, New York, NY; and
20. Department of Neurology, Weill Cornell Medical College, New York, NY