1. Department of Gynecology and Obstetrics, Kiel School of Gynecological Endoscopy, University Hospitals Schleswig-Holstein, Kiel, Germany

2. Department of Obstetrics and Gynecology, RWTH Aachen University Faculty of Medicine, Aachen, Germany

3. Department of Obstetrics and Gynecology, Certified Clinical-Scientific Level III Center for State Hospital of Villach, Carinthia, Austria