1. Department of Gynecology, Medical University of Graz, Austria
2. Department of Obstetrics and Gynecology, Medical University of Vienna, Austria
3. Department of Surgery, Medical University of Graz, Austria
4. Department of Obstetrics and Maternal-fetal Medicine, Medical University of Vienna, Austria
5. Department of Obstetrics and Gynecology, Klinikum Wels - Grieskirchen, Austria
6. Department of Obstetrics and Gynecology, Wilhelminenspital Vienna, Austria
7. Department of Midwifery, University of Applied Sciences, FH JOANNEUM, Graz, Austria
8. Department of Obstetrics and Gynecology, Bezirkskrankenhaus Schwaz, Austria