1. Department of Obstetrics, Gynecology, Gynecologic Oncology and Senology, Bethesda Hospital Duisburg, 47053 Duisburg, Germany
2. Faculty of Mathematics and Computer Science, University of Bremen, 28359 Bremen, Germany
3. Department of Obstetrics and Gynecology, Albertinen Hospital, 22457 Hamburg, Germany
4. Department of Radiology, Bethesda Hospital Duisburg, 47053 Duisburg, Germany
5. Unit of Obstetrics and Gynecology, “Paolo Giaccone” Hospital, Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties (PROMISE), University of Palermo, 90127 Palermo, Italy
6. Clinic of Gynecology, Obstetrics and Gynecological Oncology, University Hospital for Gynecology, Pius-Hospital Oldenburg, Medical Campus University of Oldenburg, 26121 Oldenburg, Germany