1. Department of Obstetrics and Gynecology, Jan Yperman Hospital, Ypres, Belgium
2. Department of Laboratory medicine, Jan Yperman Hospital, Ypres, Belgium
3. Department of Obstetrics and Gynecology, Ghent University Hospital, Ghent, Belgium
4. Molecular Biology Laboratory, Tour R. Franklin, Cliniques Universitaires Saint Luc UCL, Brussels, Belgium