1. Department of Pediatric Oncology; Emma Children's Hospital; Academic Medical Center; Amsterdam The Netherlands
2. Department of Medical Statistics and Bioinformatics; Leiden University Medical Center; Leiden The Netherlands
3. Department of Pediatric Oncology; Beatrix Children's Hospital; University of Groningen; Groningen The Netherlands
4. Department of Pediatric Oncology/Hematology; Erasmus MC-Sophia Children's Hospital; Rotterdam The Netherlands
5. Department of Pediatric Oncology/Hematology; VU University Medical Center; Amsterdam The Netherlands
6. Department of Pediatric Oncology/Hematology; Wilhelmina Children's Hospital; Utrecht The Netherlands
7. Pediatric Surgical Center Amsterdam; Academic Medical Center & VU University Medical Center; Amsterdam The Netherlands
8. Dutch Childhood Oncology Group; The Hague The Netherlands
9. Department of Pediatric Hematology; Emma Children's Hospital; Academic Medical Center; Amsterdam The Netherlands