1. Division of Haematology/Oncology The Hospital for Sick Children Toronto Ontario Canada
2. Blood and Marrow Transplant Program, Cancer and Blood Disorders Institute Johns Hopkins All Children’s Hospital St. Petersburg, Florida
3. Department of Oncology St. Jude Children’s Research Hospital Memphis Tennessee
4. Division of Critical Care, Department of Pediatric Medicine St. Jude Children’s Research Hospital Memphis Tennessee
5. Hematology and Oncology Center Beijing Children’s Hospital Beijing China
6. Division of Pediatric Hematology/Oncology Lucile Packard Children’s Hospital Stanford Palo Alto California
7. Department of Pediatric Oncology Emma Children’s Hospital, Academic Medical Center Amsterdam The Netherlands
8. Department of Pediatric Hematology/Oncology Sant Joan de Deu Hospital Barcelona Spain
9. Department of Paediatric Haematology/Oncology University Medical Centre Hamburg‐Eppendorf Hamburg Germany
10. Department of Paediatric Haematology/Oncology Meyer Children’s University Hospital Florence Italy
11. Department of Medical Oncology Beijing Friendship Hospital Beijing China
12. Pediatric Hematology/Oncology Children’s Hospital Colorado, University of Colorado School of Medicine Denver Colorado
13. Division of Pediatric Hematology/Oncology Phoenix Children’s Hospital Phoenix Arizona
14. Pediatric Hematology/Oncology Blank Children’s Hospital Des Moines, Iowa
15. Department of Paediatric Haematology/Oncology BioCruces Health Research Institute, Cruces University Hospital Bizkaia Spain
16. Pediatric Oncology Memorial Sloan Kettering Cancer Center New York New York
17. Immunology Laboratory Willem‐Alexander Children’s Hospital, Leiden University Medical Center Leiden The Netherlands
18. Department of Biostatistics St. Jude Children’s Research Hospital Memphis Tennessee