1. Service of Hematology/Oncology Hospital JP Garrahan Buenos Aires Argentina
2. Service of Diagnostic Imaging Hospital JP Garrahan Buenos Aires Argentina
3. Service of Pathology Hospital JP Garrahan Buenos Aires Argentina
4. Division of Haematology/Oncology Hospital for Sick Children Toronto Ontario Canada
5. Children's Cancer Centre Royal Children's Hospital Melbourne Victoria Australia
6. Division of Cancer Murdoch Children's Research Institute Melbourne Victoria Australia
7. Department of Paediatrics University of Melbourne Melbourne Victoria Australia
8. Department of Paediatric Haematology and Oncology Second Medical School Charles University and University Hospital Motol Prague Czech Republic
9. Children's Haematology/Oncology Centre Christchurch Hospital Christchurch New Zealand
10. Department of Oncology Hospital Sant Joan de Déu Barcelona Spain
11. Developmental Tumor Biology Laboratory Institut de Recerca Sant Joan de Déu Barcelona Spain
12. Department of Pathology Hospital Sant Joan de Déu Barcelona Spain
13. Department of Pediatric Hematology and Oncology University Medical Center Hamburg‐Eppendorf Hamburg Germany
14. Research Institute Children's Cancer Center Hamburg Hamburg Germany
15. Institute of Neuropathology University Medical Center Hamburg‐Eppendorf Hamburg Germany
16. Program in Developmental and Stem Cell Biology Arthur and Sonia Labatt Brain Tumour Research Centre Hospital for Sick Children Toronto Ontario Canada