1. Princess Máxima Center for Pediatric Oncology Utrecht The Netherlands
2. Emma Children's Hospital, Amsterdam UMC, Pediatric Oncology Vrije Universiteit Amsterdam Amsterdam The Netherlands
3. Department of Hematology Erasmus MC Cancer Institute Rotterdam The Netherlands
4. Department of Pediatric Oncology Erasmus MC‐Sophia Children's Hospital Rotterdam The Netherlands
5. Department of Research and Development Netherlands Comprehensive Cancer Organization (IKNL) Utrecht The Netherlands