1. Department of Paediatrics, Division of Paediatric Oncology/Haematology, VU University Medical Center, De Boelelaan 1117, HV, Amsterdam, The Netherlands
2. Department of Obstetrics and Gynaecology, VU University Medical Center, De Boelelaan 1117, HV, Amsterdam, The Netherlands
3. Princess Máxima Center for Paediatric Oncology, Lundlaan 6, EA, Utrecht, The Netherlands
4. Willem-Alexander Children’s Hospital, Leiden University Medical Center, Albinusdreef 2, ZA, Leiden, The Netherlands
5. Department of Paediatric Oncology, Sophia Children’s Hospital/Erasmus MC University Medical Center, Wytemaweg 80, CN, Rotterdam, The Netherlands
6. Department of Paediatric Oncology, Emma Children’s Hospital/Academic Medical Center, Meibergdreef 9, AZ, Amsterdam, The Netherlands
7. Department of Paediatric Oncology, Radboud University Medical Center, Geert Grooteplein Zuid 10, GA, Nijmegen, The Netherlands
8. Department of Paediatric Oncology, Beatrix Children’s Hospital, University of Groningen, University Medical Center Groningen, Hanzeplein 1, GZ, Groningen, The Netherlands
9. Department of Paediatric Oncology, Wilhelmina’s Children’s Hospital/University Medical Center, Lundlaan 6, EA, Utrecht, The Netherlands
10. Dutch Childhood Oncology Group, Zinkwerf 5-7, EC, The Hague, The Netherlands
11. Department of Clinical Chemistry, Endocrine Laboratory, VU University Medical Center, De Boelelaan 1117, HV, Amsterdam, The Netherlands
12. Department of Epidemiology and Biostatistics, Netherlands Cancer Institute, Plesmanlaan 121, CX, Amsterdam, The Netherlands
13. Department of Epidemiology and Biostatistics and the EMGO(+) Institute for Health and Care Research, VU University Medical Centre, De Boelelaan 1117, HV, Amsterdam, The Netherlands
14. Department of Gynaecology and Obstetrics, Division Reproductive Medicine, Erasmus MC University Medical Center, ‘s-Gravendijkwal 230, CE, Rotterdam, The Netherlands
15. Department of Obstetrics and Gynaecology, Radboud University Medical Center, Geert Grooteplein Zuid 10, GA, Nijmegen, The Netherlands