1. Department of Obstetrics and Gynaecology Medical University Vienna Vienna Austria
2. Department of Obstetrics and Gynaecology Karl Landsteiner University of Health Sciences University Hospital Tulln Tulln Austria
3. Department of Obstetrics and Gynaecology Medical University Graz Graz Austria
4. Department of Gynecology and Obstetrics Perinatal Center, Klagenfurt am Wörthersee Klagenfurt Austria
5. Department of Obstetrics and Gynaecology Medical University Innsbruck Innsbruck Austria
6. Department of Obstetrics St. Josef Krankenhaus Vienna Austria