1. Department of Obstetrics and Gynecology, University Hospital Leuven, Leuven, Belgium
2. Department of Obstetrics and Gynecology, AZ Groeninge, Kortrijk, Belgium
3. Department of Obstetrics and Gynecology, Sint-Trudo Hospital, Sint-Truiden, Belgium
4. Department of Radiology, University Hospital Leuven, Leuven, Belgium