1. Department of Pediatric Oncology, Emma Children’s Hospital, Amsterdam University Medical Center (UMC), University of Amsterdam, Amsterdam, the Netherlands
2. Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
3. Department of Epidemiology and Biostatistics, the Netherlands Cancer Institute, Amsterdam, the Netherlands
4. Department of Pediatric Oncology/Hematology, University of Groningen/Beatrix Children’s Hospital, University Medical Center Groningen, Groningen, the Netherlands
5. Department of Pediatric Oncology/Hematology and Medicine section Endocrinology, Sophia Children’s Hospital/Erasmus Medical Center, Rotterdam, the Netherlands
6. Department of Hematology, Radboud University Medical Center, Nijmegen, the Netherlands
7. Department of Internal Medicine, Leiden University Medical Center, Leiden, the Netherlands
8. Department of Pediatric Oncology and Hematology, Wilhelmina Children’s Hospital/ University Medical Center Utrecht, the Netherlands
9. Department of Pediatric Oncology/Hematology, Sophia Children’s Hospital/Erasmus Medical Center, Rotterdam, the Netherlands
10. Department of Pediatric Oncology/Hematology, Amsterdam University Medical Center, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
11. Department of Medical Informatics, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, the Netherlands
12. Department of Pediatric Endocrinology, Wilhelmina Children’s Hospital, University Medical Center Utrecht, Utrecht, the Netherlands
13. Dutch Childhood Oncology Group, Utrecht, the Netherlands
14. Department of Radiation Oncology, University of Groningen/ University Medical Center Groningen, Groningen, the Netherlands
15. Foundation PALGA (Nationwide Network and Registry of Histopathology and Cytopathology), Houten, the Netherlands
16. Department of Human Genetics, University Medical Center Utrecht, Utrecht, the Netherlands
17. Department of Medical Genetics, University Medical Center Utrecht, Utrecht, the Netherlands