1. Department of Pediatric Oncology/Hematology, Erasmus MC-Sophia Children’s Hospital, Rotterdam, The Netherlands;
2. Dutch Childhood Oncology Group, The Hague, The Netherlands;
3. Department of Pediatric Oncology-Hematology, VU University Medical Center, Amsterdam, The Netherlands;
4. Department of Pediatric Hematology and Oncology, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands;
5. Department of Pediatric Hematology-Oncology, University Medical Center Utrecht-Wilhelmina Children’s Hospital, Utrecht, The Netherlands;
6. Department of Pediatric Oncology, Academic Medical Center-Emma Children’s Hospital, Amsterdam, The Netherlands;
7. Department of Pediatric Immunology, Hemato-Oncology and Stem Cell Transplantation, Leiden University Medical Center, Leiden, The Netherlands;
8. Department of Biostatistics, Erasmus MC-University Medical Center, Rotterdam, The Netherlands;
9. Department of Pediatric Hematology/Oncology, University Children’s Hospital, Muenster, Germany;
10. Department of Pharmaceutical Sciences, St. Jude Children’s Research Hospital, Memphis, TN; and
11. Department of Pediatric Oncology and Hematology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands