1 Department of Obstetrics and Gynecology, Research Institute Amsterdam Reproduction and Development, Amsterdam UMC, location VUMC, Amsterdam, The Netherlands.
2 Department of Obstetrics and Gynecology, University Hospitals Leuven, Leuven, Belgium.
3 Department of Development and Regeneration, KU Leuven, Leuven, Belgium.
4 Department of Obstetrics and Gynaecology, Queen Charlotte's and Chelsea Hospital, Imperial College London, London, UK.
5 Department of Obstetrics and Gynecology, Amsterdam UMC, location AMC, Amsterdam, The Netherlands.