1 Research Group Reproductive Medicine, Department of Development and Regeneration, Organ Systems, Group Biomedical Sciences, KU Leuven (University of Leuven), Leuven, Belgium.
2 Department of Obstetrics, Gynecology, and Reproductive Sciences, Yale School of Medicine, New Haven, Connecticut, USA.
3 Global Medical Affairs Fertility, Research, and Development, Merck Healthcare KGaA, Darmstadt, Germany.