1. Department of Pediatric Oncology, Erasmus Medical Center – Sophia Children's Hospital, Rotterdam, the Netherlands
2. Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
3. Department of Phoniatrics and Pedaudiology, University of Münster, Münster, Germany
4. Department of Pediatric Oncology, University Medical Center Groningen – Beatrix Children's Hospital, Groningen, the Netherlands
5. Department of Pediatric Oncology, Radboud University Medical Center, Nijmegen, the Netherlands
6. Department of Pediatrics, VU University Medical Center, Amsterdam, the Netherlands
7. Department of Pediatric Stem Cell Transplantation, Leiden University Medical Center – Willem-Alexander Children's Hospital, Leiden, the Netherlands
8. Department of Pediatric Oncology, University Medical Center Utrecht – Wilhelmina Children's Hospital, Utrecht, the Netherlands
9. Department of Pediatric Oncology, Academic Medical Center – Emma Children's Hospital, Amsterdam, the Netherlands
10. Department of Endocrinology, Erasmus MC, Rotterdam, the Netherlands