1. Princess Maxima Center for Pediatric Oncology, Utrecht, The Netherlands
2. Amsterdam UMC, Location AMC, Amsterdam, The Netherlands
3. VU University Medical Center, Amsterdam, The Netherlands
4. Netherlands Cancer Institute, Amsterdam, The Netherlands
5. Erasmus Medical Center/Sophia Children’s Hospital, Rotterdam, The Netherlands
6. Radboud University Medical Center, Nijmegen, The Netherlands
7. UMC Amsterdam, Emma Children’s Hospital/Academic Medical Center, Amsterdam, The Netherlands
8. Willem Alexander Children’s Hospital/Leiden University Medical Center, Leiden, The Netherlands
9. University Medical Center Utrecht, Utrecht, The Netherlands
10. Brandenburg Medical School Theodor Fontane, Neuruppin, Germany
11. Erasmus Medical Center, Rotterdam, The Netherlands
12. Stichting KinderOncologie Nederland (SKION)/Dutch Childhood Oncology Group (DCOG), The Hague, The Netherlands
13. University of Groningen/University Medical Center Groningen, Groningen, The Netherlands