1. Department of Pediatric Oncology and Pediatrics Emma Children's Hospital Amsterdam UMC University of Amsterdam Amsterdam The Netherlands
2. Princess Máxima Center for Pediatric Oncology Utrecht The Netherlands
3. Department of Clinical Sciences Pediatric Oncology and Hematology Skåne University Hospital Lund University Lund Sweden
4. Department of Hematology Radboud University Medical Center Nijmegen The Netherlands
5. Department of Pediatric Oncology/Hematology Amsterdam UMC Vrije Universiteit Amsterdam Amsterdam The Netherlands
6. Department of Paediatric and Adolescent Haematology and Oncology and Children's BMT Unit Great North Children's Hospital Newcastle upon Tyne Hospitals NHS Foundation Trust and Northern Institute of Cancer Research Newcastle University Newcastle upon Tyne UK
7. Department of Oncology St Jude Children's Research Hospital Memphis Tennessee
8. Department of Pediatric Oncology/Hematology Beatrix Children's Hospital/University of Groningen/University Medical Center Groningen Groningen The Netherlands
9. Netherlands Institute for Health Services Research Utrecht The Netherlands