Chloƫ De Roo (Division of Reproductive Medicine, Department of Gynaecology, Ghent University Hospital, 9000 Ghent), Kelly Tilleman (Division of Reproductive Medicine, Department of Gynaecology, Ghent University Hospital, 9000 Ghent), Sylvie Lierman (Division of Reproductive Medicine, Department of Gynaecology, Ghent University Hospital, 9000 Ghent), Guy T'Sjoen (Ghent University), Ria Cornelissen (Department of Basic Medical Science, Faculty of Medicine and Health Science, Ghent University, 9000 Ghent), Steven Weyers (Department of Gynaecology, Ghent University Hospital, 9000 Ghent), Petra De Sutter (Division of Reproductive Medicine, Department of Gynaecology, Ghent University Hospital, 9000 Ghent)