1. Department of Endocrinology, Internal Medicine, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.
2. Department of Obstetrics and Gynaecology, Center for Reproductive Medicine, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.
3. Paediatric Oncology, Emma Children's Hospital, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.
4. Department of Epidemiology and Biostatistics, Netherlands Cancer Institute, Amsterdam, The Netherlands.
5. Department of Laboratory Medicine, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.
6. Department of Epidemiology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.
7. Department of Nuclear Medicine and Molecular Imaging, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.
8. Department of Internal Medicine, VU University Medical Center Amsterdam UMC, Amsterdam, The Netherlands.
9. Division of Endocrinology, Department of Internal Medicine, Maastricht University Medical Center, Maastricht, The Netherlands.
10. Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands.
11. Department of Pediatric Oncology, Sophia Children's Hospital, Erasmus Medical Center, Rotterdam, The Netherlands.
12. Division of Endocrinology, Department of Internal Medicine, Leiden University Medical Center, Leiden, The Netherlands.
13. Division of Endocrinology, Department of Internal Medicine, Radboud University Medical Center, Nijmegen, The Netherlands.
14. Department of Medical Oncology, Academic Medical Center, Amsterdam UMC, Amsterdam, The Netherlands.
15. Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands
16. Rotterdam Thyroid Center, Erasmus Medical Center, Rotterdam, The Netherlands
17. Department of Surgical Oncology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.
18. Medical University Brandenburg, Neuruppin, Germany.
19. Department of Pediatrics, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, The Netherlands.
20. Department of Paediatric Oncology and Beatrix Children's Hospital, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.
21. Department of Pediatric Endocrinology, Beatrix Children's Hospital, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.