1. Department of Obstetrics and Gynecology, Division of Women and Baby; University Medical Centre Utrecht; Utrecht The Netherlands
2. Department of Endocrinology; Academic Medical Centre; Amsterdam The Netherlands
3. Department of Internal Medicine; Meander Medical Centre; Amersfoort The Netherlands
4. Department of Endocrinology; University Medical Centre Utrecht; Utrecht The Netherlands
5. Department of Obstetrics and Gynecology; Academic Medical Centre; Amsterdam The Netherlands
6. Department of Obstetrics and Gynecology; Martini Hospital; Groningen The Netherlands
7. Department of Internal Medicine; Martini Hospital; Groningen The Netherlands
8. Department of Obstetrics and Gynecology; OLVG; Amsterdam The Netherlands
9. Department of Internal Medicine; OLVG; Amsterdam The Netherlands
10. Department of Obstetrics and Gynecology; Maxima Medical Centre; Veldhoven The Netherlands
11. Department of Internal Medicine; Maxima Medical Centre; Veldhoven The Netherlands
12. Department of Obstetrics and Gynecology; Isala Hospital; Zwolle The Netherlands
13. Department of Internal Medicine; Isala Hospital; Zwolle The Netherlands
14. Department of Obstetrics and Gynecology; University Medical Centre St Radboud; Nijmegen The Netherlands
15. Department of Internal Medicine; University Medical Centre St Radboud; Nijmegen The Netherlands
16. Department of Obstetrics and Gynecology; St Lucas Andreas Hospital; Amsterdam The Netherlands
17. Department of Internal Medicine; St Lucas Andreas Hospital; Amsterdam The Netherlands
18. Department of Obstetrics and Gynecology; Jeroen Bosch Hospital; Den Bosch The Netherlands
19. Department of Internal Medicine; Jeroen Bosch Hospital; Den Bosch The Netherlands
20. Department of Obstetrics and Gynecology; Zuyderland Medical Centre; Heerlen The Netherlands
21. Department of Obstetrics and Gynecology; Albert Schweitzer Hospital; Dordrecht The Netherlands
22. Department of Internal Medicine; Albert Schweitzer Hospital; Dordrecht The Netherlands
23. Julius Centre for Health Sciences and Primary Care; University Medical Centre Utrecht; Utrecht The Netherlands
24. The Robinson Research Institute, School of Medicine; University of Adelaide; Adelaide Australia
25. The South Australian Health and Medical Research Institute Adelaide; Adelaide Australia
26. Department of Obstetrics and Gynecology; Meander Medical Centre; Amersfoort The Netherlands