1. Pediatric Hematology and Oncology Hospital Universitari Vall d'Hebron Barcelona Spain
2. Dana‐Farber/Boston Children's Cancer and Blood Disorders Center Harvard Medical School Boston Massachusetts
3. Department of Paediatrics Hospital for Sick Children and University of Toronto Toronto ON Canada
4. Department of Pediatric Oncology and Hematology University of Cologne Cologne Germany
5. Division of Oncology and Center for Childhood Cancer Research Children's Hospital of Philadelphia and University of Pennsylvania Philadelphia Pennsylvania
6. Research Institute for Clinical Oncology Saitama Cancer Center Saitama Japan
7. Pediatrics Institut Gustave Roussy Paris France
8. Pediatric Hematology Oncology Center Schneider Children's Medical Center of Israel Petah Tikva Israel
9. CCRI Children Cancer Research Institute Vienna Austria
10. Department of Pediatrics University of Chicago Chicago Illinois
11. Division of Clinical Studies Institute of Cancer Research Royal Marsden Hospital Sutton UK