1. Department of Endocrinology, University Hospital Gasthuisberg, KU Leuven, Leuven, Belgium
2. Department of Endocrinology, Onze-Lieve-Vrouwziekenhuis Aalst-Asse-Ninove, Aalst, Belgium
3. Department of Gynaecology and Obstetrics, University Hospital Gasthuisberg, KU Leuven, Leuven, Belgium
4. Department of Obstetrics and Gynecology, Onze-Lieve-Vrouwziekenhuis Aalst-Asse-Ninove, Aalst, Belgium
5. Department of Endocrinology, Imelda Ziekenhuis, Bonheiden, Belgium
6. Department of Obstetrics and Gynecology, Imelda Ziekenhuis, Bonheiden, Belgium
7. Department of Endocrinology-Diabetology and Metabolic Diseases, Antwerp University Hospital, Edegem, Belgium
8. Department of Gynaecology, Obstetrics and Fertility, Antwerp University Hospital, Edegem, Belgium
9. Department of Endocrinology, Kliniek Sint-Jan, Brussels, Belgium
10. Department of Obstetrics and Gynecology, Kliniek Sint-Jan, Brussels, Belgium
11. Department of Endocrinology, AZ Sint-Jan, Brugge, Belgium
12. Department of Obstetrics and Gynecology, AZ Sint-Jan, Brugge, Belgium
13. Leuven Biostatistics and Statistical Bioinformatics Centre, KU Leuven, Leuven, Belgium