1. Pediatric Oncology, Cancer Center Amsterdam Emma Children's Hospital, Amsterdam UMC, Vrije Universiteit Amsterdam Amsterdam The Netherlands
2. Department of Pediatric Hematology Princess Máxima Center for Pediatric Oncology Utrecht The Netherlands
3. Department of Clinical Genetics Erasmus MC University Medical Center Rotterdam The Netherlands
4. Pediatric Hematology/Oncology Hannover Medical School Hannover Germany
5. Department of Pathology St. Jude Children's Research Hospital Memphis Tennessee USA
6. Department of Pediatric Hematology‐Oncology University Hospital Essen Essen Germany
7. Clinical laboratory Dutch Childhood Oncology Group The Hague The Netherlands
8. Department of Pediatrics Queen Silvia Children's Hospital Gothenburg Sweden
9. Children's Leukemia Cooperative Group/European Organisation for Research and Treatment of Cancer Institut d'Hématologie et d'Oncologie Pédiatrique Lyon France
10. St. Anna Children's Hospital and Children's Cancer Research Institute Medical University of Vienna Vienna Austria
11. Grupo Argentino de Tratamiento de la Leucemia Aguda Children's Hospital La Plata La Plata Buenos Aires Argentina
12. Department of Paediatric Haematology United Kingdom Childhood Leukaemia Study Group Royal Hospital for Children Glasgow UK
13. Department of Pediatrics/Pediatric oncology Hong Kong Children's Hospital Hong Kong China
14. Leukaemia Research Cytogenetics Group, Translational and Clinical Research Institute Newcastle University Centre for Cancer Newcastle upon Tyne UK
15. Department of Pediatrics Aarhus University Hospital Skejby Aarhus Denmark
16. Schneider Children's Medical Center, Sackler School of Medicine Tel‐Aviv University Tel‐Aviv Israel
17. Hematopathology Department Assistance Publique Hopitaux de Paris Paris France
18. Oncology and Immunology Dmitriy Rogachev Federal Center for Pediatric Hematology Moscow Russia
19. Children's Center for Cancer and Blood Diseases Peyton Manning Children's Hospital at St. Vincent Indianapolis Indiana USA
20. Pediatric Hematology‐Oncology Unit, Department of Pediatrics University of Milano‐Bicocca, S. Gerardo Hospital Monza Italy
21. Department of Pediatric Hematology and Oncology Carles University in Prague/Second Faculty of Medicine and University Hospital Motol Prague Czech Republic