1. 1Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
2. 2Division of Hematology and Oncology, Department of Pediatrics, Hospital for Sick Children, Toronto, Canada
3. 3Department of Pediatric Hematology and Oncology, University Hospital La Fe of Valencia, Valencia, Spain
4. 4Hematopathology section, Pathology Department, Hospital Clinic of Barcelona, University of Barcelona, Barcelona, Spain
5. 5Maternal and Child Health Department, Pediatric Hematology, Oncology and Stem Cell Transplant Center, University of Padova, Padova, Italy
6. 6Department of Paediatrics & Adolescent Medicine, The University of Hong Kong, Hong Kong
7. 7Pediatric Clinic (Tűzoltó Street Department), Semmelweis University, Budapest, Hungary
8. 8Department of Pediatric Hematology and Oncology, Department of Pediatrics, University Hospital Liège, Liège, Belgium
9. 9Department of Pediatric Hematology and Oncology, Cliniques universitaires Saint-Luc, UC Louvain, Brussels, Belgium
10. 10Department of Pediatric Hematology and Oncology, Schneider Children's Medical Center, Petah Tikva, and Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
11. 11Department of Hematology and Oncology for children and adolescents, Sapporo Hokuyu Hospital, Sapporo, Japan
12. 12Department of Clinical Haematology, Oncology, Blood and Marrow Transplantation, Perth Children's Hospital, Perth, Australia
13. 13Leukaemia Translational Research Laboratory, Telethon Kids Cancer Centre, Telethon Kids Institute, University of Western Australia, Perth, Australia
14. 14Curtin Medical School, Curtin University, Perth, Australia
15. 15Department of Pediatric Hematology and Oncology, Charles University and University Hospital Motol, Prague, Czech Republic
16. 16Hematopathology Section, Department of Pathology, University Hospital Schleswig-Holstein, Kiel, Germany
17. 17Department of Pediatric Hematology and Oncology, Federal Center for Pediatric Hematology, Oncology and Immunology, Moscow, Russia
18. 18Department of Pediatric and Adolescent Oncology, Gustave-Roussy Cancer Campus, Paris-Sacaly University, Villejuif, France
19. 19Department of Clinical Research, Saitama Children’s Medical Center, Saitama, Japan
20. 20Department of Pathology, Institut d’Investigacions Biomèdiques August Pi i Sunyer, Barcelona, Spain
21. 21Pediatric Hematology and Oncology and NHL-BFM Study Center, University Hospital Münster, Münster, Germany
22. 22Department of Pediatric Hematology and Oncology, Hospital Clínico Universitario, Biomedical Research Institute, INCLIVA, Valencia, Spain
23. 23Department of Pediatric Hematology and Oncology, St. Anna Children's Hospital, Medical University of Vienna, Vienna, Austria
24. 24Pediatric Hematology and Oncology and NHL-BFM Study Center, Medical Center Hamburg-Eppendorf, Hamburg, Germany
25. 25St. Anna Children’s Cancer Research Institute, Vienna, Austria