1. Department of Endocrinology, University Hospital Gasthuisberg , KU Leuven, 3000 Leuven , Belgium
2. Faculty of Medicine , KU Leuven, 3000 Leuven , Belgium
3. Department of Endocrinology, OLV ziekenhuis Aalst-Asse-Ninove , 9300 Aalst , Belgium
4. Department of Obstetrics & Gynecology, University Hospital Gasthuisberg , KU Leuven, 3000 Leuven , Belgium
5. Department of Obstetrics & Gynecology, OLV ziekenhuis Aalst-Asse-Ninove , 9300 Aalst , Belgium
6. Department of Endocrinology, Imelda ziekenhuis , 2820 Bonheiden , Belgium
7. Department of Obstetrics & Gynecology, Imelda ziekenhuis , 2820 Bonheiden , Belgium
8. Department of Endocrinology-Diabetology-Metabolism, Antwerp University Hospital , 2650 Edegem , Belgium
9. Department of Obstetrics & Gynecology, Antwerp University Hospital , 2650 Edegem , Belgium
10. Department of Endocrinology, Kliniek St-Jan , 1000 Brussel , Belgium
11. Department of Obstetrics & Gynecology, Kliniek St-Jan , 1000 Brussel , Belgium
12. Department of Endocrinology, AZ St Jan , 8000 Brugge , Belgium
13. Department of Obstetrics & Gynecology, AZ St Jan , 8000 Brugge , Belgium
14. Center of Biostatics and Statistical bioinformatics , KU Leuven, 3000 Leuven , Belgium