1. Ghent Fertility and Stem Cell Team (G-FaST), Department for Reproductive Medicine, Ghent University Hospital, 9000 Ghent, Belgium.
2. These authors contributed equally to this work.
3. Department of Anatomy and Embryology, Leiden University Medical Center, 2300 Leiden, The Netherlands.
4. Laboratory of Pharmaceutical Biotechnology, Faculty of Pharmaceutical Sciences, Ghent University, 9000 Ghent, Belgium.