1. Department of Gynaecology & Obstetrics; Antwerp University Hospital, University of Antwerp; Antwerp Belgium
2. Department of Gynaecology & Obstetrics; Ghent University Hospital; Ghent Belgium
3. Department of Medical Genetics; University Hospital Antwerp, University of Antwerp; Edegem Belgium
4. Institute of Human Genetics, University of Bonn; Bonn Germany
5. Department of Neonatology; Children's Hospital, University of Bonn; Bonn Germany
6. Department of Pathology; University Hospital Antwerp, University of Antwerp; Antwerp Belgium