1. Department of Gynecology and Obstetrics, University Hospitals Schleswig-Holstein, Campus Kiel , Arnold-Heller Str. 3, Building 24 , 24105 Kiel , Germany
2. Department of Anatomy, Institute of Anatomy, Center of Clinical Anatomy, University Hospitals Schleswig-Holstein, Campus Kiel , Otto-Hahn-Platz 8 , 24118 Kiel , Germany
3. Possover International Medical Center , Zürich , Switzerland
4. Department of Gynecology, University of Aarhus , Aarhus , Denmark