1 Department of Obstetrics and Gynecology, Academic Hospital Cologne Weyertal University of Cologne, University Witten-Herdecke, Weyertal 76, Cologne 50933, Germany. Electronic address: piriyev.elvins@gmail.com.
2 Department of Obstetrics and Gynecology, University Witten-Herdecke, Marien-Hospital, Witten Marienplatz, Witten 258452, Germany.
3 Department of Obstetrics and Gynecology Academic Hospital Cologne Weyertal University of Cologne, Germany.