Affiliations:
1 Department of Obstetrics and Gynaecology, Amsterdam University Medical Centre, Meibergdreef 9, P.O. box 22660, 1100 DD Amsterdam, The Netherlands
2 Perined, Mercatorlaan 1200, 3528 BL Utrecht, The Netherlands
3 Department of Obstetrics and Gynaecology, Leiden University Medical Centre, building 1, room K-6-P-35, P.O. Box 9600, 2300 RC Leiden, The Netherlands
4 Department of Healthcare Studies, Rotterdam University of Applied Sciences, 3015 EK Rotterdam, the Netherlands.
5 Athena Institute, Faculty of Science, VU University Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands