1 Department of Obstetrics & Gynaecology, GROW School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht, The Netherlands.
2 Center for Reproductive Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
3 IVF Department, Catharina Hospital, Eindhoven, The Netherlands.
4 Center for Reproductive Medicine, St. Elisabeth Hospital, Tilburg, The Netherlands.
5 Section of Reproductive Medicine, Department of Obstetrics and Gynecology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
6 Department of Obstetrics and Gynaecology, Radboud University Medical Center, Nijmegen, The Netherlands.