1. Department of Obstetrics and Gynecology, University Hospital Brugmann, Université Libre de Bruxelles, Brussels, Belgium
2. Department of Obstetrics and Gynecology, Hôpital Civil Marie Curie, Charleroi, Belgium
3. Department of Obstetrics and Prenatal Medicine, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel, Brussels, Belgium