1. Department of Obstetrics and Gynaecology, Elisabeth-Tweesteden Hospital, 5000 LC Tilburg, the Netherlands
2. Department of Obstetrics and Gynaecology and Department of Pathology, Radboud University Nijmegen Medical Centre, 6500 HB Nijmegen, the Netherlands
3. Department of Pathology, Elisabeth-Tweesteden Hospital, 5000 LC Tilburg, the Netherlands
4. Department of Obstetrics and Gynaecology, Amphia Ziekenhuis, Breda, the Netherlands
5. Department of Obstetrics and Gynaecology, Catharina Hospital, Eindhoven, the Netherlands
6. Department of Obstetrics and Gynaecology, Jeroen Bosch Ziekenhuis, s-Hertogenbosch, the Netherlands
7. Department of Biochemistry, Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, 6500 HB Nijmegen, the Netherlands
8. Department of Obstetrics and Gynaecology, Radboud University Nijmegen Medical Centre, 6500 HB Nijmegen, the Netherlands