1. Center for Human Genetics, Catholic University of Leuven, 3000 Leuven, Belgium;
2. Maastricht University Medical Centre, GROW School of Oncology and Developmental Biology, 6229HX Maastricht, The Netherlands;
3. Department of Obstetrics and Gynecology, St-Jans Hospital, 3600 Genk, Belgium;
4. Hasselt University Diepenbeek, 3500 Hasselt, Belgium;
5. Department of Obstetrics and Gynecology, Tongeren, Belgium