1. Department of Pediatrics Willem‐Alexander Children's Hospital Leiden University Medical Centre Leiden The Netherlands
2. Department of Medical Ethics and Health Law Leiden University Medical Centre Leiden The Netherlands
3. Department of Hematology Amsterdam UMC, University of Amsterdam Amsterdam The Netherlands
4. Department of Blood Cell Research Sanquin Research Amsterdam The Netherlands
5. Department of Hematology HAGA Hospital The Hague The Netherlands
6. Department of Pediatric Hematology Emma Children's Hospital, Academic Medical Center Amsterdam The Netherlands
7. Department of Pediatric Hematology and Oncology Erasmus MC Sophia Children's Hospital University Medical Center Rotterdam Rotterdam The Netherlands