1. Department of Obstetrics and Gynaecology; Medical University of Graz; Graz Austria
2. Department of Obstetrics and Gynaecology; Heidelberg University Hospital; Heidelberg Germany
3. Department of Obstetrics and Gynaecology; Lille University Hospital; Lille France
4. Department of Obstetrics and Gynaecology; University Hospitals Leuven; Leuven Belgium
5. Department of Obstetrics and Gynaecology; University Clinical Centre Ljubljana; Ljubljana Slovenia
6. Department of Obstetrics and Gynaecology; Paris Sud 11 University; Paris France
7. Department of Obstetrics and Gynaecology; Medical University of Vienna; Vienna Austria
8. Department for Risk Assessment, Data and Statistics; Austrian Agency for Health and Food Safety; Vienna Austria
9. Department of Obstetrics and Gynaecology; Medical School - University of Porto; Porto Portugal