1. Department of Gynecology and Obstetrics, University Hospital Tuebingen, Calwerstrasse 7, 72076 Tuebingen, Germany
2. Department of Urology, Cantonal Hospital St. Gallen, Rorschacher Strasse 95, 9000 St. Gallen, Switzerland
3. Department of Gynecology and Obstetrics, Diakonie Klinikum Schwaebisch Hall, Diakoniestrasse 10, 74523 Schwaebisch Hall, Germany