1. Department of Obstetrics and Gynecology, Jessa Hospital, Stadsomvaart 11, 3500 Hasselt, Belgium
2. Department of Obstetrics and Gynecology, University Hospital KU Leuven Gasthuisberg, Herestraat 49, 3000 Leuven, Belgium
3. Department of Pathology, Jessa Hospital, Stadsomvaart 11, 3500 Hasselt, Belgium