1. Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) Barcelona Spain
2. Centro de Investigación Biomédica en Red‐Oncología (CIBERONC) Madrid Spain
3. Haematopathology Unit Hospital Clínic Barcelona Spain
4. Paediatric Oncology Department Hospital Clínic Valencia Spain
5. Paediatric Oncology Department Hospital Sant Joan de Déu Esplugues de Llobregat Spain
6. Paediatric Oncology Department Hospital Vall d'Hebron Barcelona Spain
7. Anatomic Pathology Department Hospital Vall d'Hebron Barcelona Spain
8. Paediatric Oncohaematology Department Donostia University Hospital Biodonostia Health Research Institute San Sebastian Spain
9. Paediatric Oncology Department Hospital Universitario Virgen de la Nieves Granada Spain
10. Division of Haematology‐Oncology CHU Sainte‐Justine Research Center Montreal Canada
11. Department of Paediatrics Faculty of Medicine University of Montreal Montreal Canada
12. Genetics, Physics Anthropology and Animal Physiology Faculty of Science and Technology UPV/EHU Leioa Spain
13. Paediatric Haematology and Oncology Department Hospital Clínico Universitario de Santiago de Compostela Santiago de Compostela Spain
14. Paediatric Oncohaematology Department Hospital Clínico Universitario Virgen de la Arrixaca Murcia Spain
15. Paediatric Department Osakidetza Biocruces Bizkaia Health Research Institute Hospital Universitario Cruces Barakaldo Spain
16. Paediatric Department Universidad del Pais Vasco UPV/EHU Leioa Spain
17. Paediatric Oncology Department Hospital La Fe Valencia Spain
18. Anatomic Pathology Department Hospital La Fe Valencia Spain
19. Biocruces Bizkaia Health Research Institute Department of Genetics, Physical Anthropology & Animal Physiology, Science and Technology Faculty University of the Basque Country UPV/EHU Leioa Spain