1. Princess Máxima Center for Pediatric Oncology Utrecht The Netherlands
2. Department of Health Sciences and Medicine University of Lucerne Lucerne Switzerland
3. Department of Pediatrics Amsterdam UMC University of Amsterdam Amsterdam The Netherlands
4. Department of Pediatric Oncology University of Groningen University Medical Center Groningen Groningen The Netherlands
5. Radboud University Medical Center Nijmegen The Netherlands
6. Erasmus MC Sophia Children's Hospital Erasmus Medical Center Rotterdam The Netherlands
7. Department of Health Services Research Carl von Ossietzky University of Oldenburg Oldenburg Germany
8. Leiden University Medical Center Leiden The Netherlands
9. Willem Alexander Children's Hospital Leiden The Netherlands
10. Department of Obstetrics and Gynecology Amsterdam UMC location University of Amsterdam Amsterdam The Netherlands
11. Amsterdam Reproduction and Development Amsterdam The Netherlands