1. Kiel School of Gynaecological Endoscopy, Department of Obstetrics and Gynecology, University Hospitals Schleswig-Holstein, Campus Kiel, Arnold-Heller-Str. 3 (House C), 24105 Kiel, Germany
2. Clinic of Obstetrics and Gynecology, St. Elisabeth Hospital, 49401 Damme, Germany
3. Department of Obstetrics and Gynecology, University Witten/Herdecke, Rheinland Klinikum Dormagen, Dr.-Geldmacher-Straße 20, 41540 Dormagen, Germany
4. Midwifery Department, Ministry of Health and Medical Education, Tehran 1467664961, Iran
5. Department of Obstetrics and Gynaecology, The George Washington University Hospital, Washington, DC 20037, USA
6. Clinic of Urology, Charité—Universitätsmedizin Berlin, Hindenburgdamm 30, 12200 Berlin, Germany