1 Obstetrics and Gynecology Department, Erasme Hospital, Brussels, Belgium; Research Laboratory on Human Reproduction, Université Libre de Bruxelles, Brussels, Belgium. Electronic address: oranite.goldrat@erasme.ulb.ac.be.
2 Research Laboratory on Human Reproduction, Université Libre de Bruxelles, Brussels, Belgium. Electronic address: idemeest@ulb.ac.be.
3 BrEAST Data Centre, Department of Medicine, Institut Jules Bordet, Université Libre de Bruxelles, Boulevard de Waterloo, 121, Brussels, Belgium. Electronic address: hatem.azim@bordet.be.