1. Department of Obstetrics and Gynecology; Medical University Vienna; Vienna Austria
2. Division of Obstetrics and Feto-Maternal Medicine; Department of Obstetrics and Gynecology; Medical University Vienna; Vienna Austria
3. Clinical Division for General Gynecology and Gynecological Oncology; Department of Obstetrics and Gynecology; Medical University Vienna; Vienna Austria
4. Department of Clinical Epidemiology Tirol Kliniken; Innsbruck Austria