1. Department of Obstetrics and Gynecology, University of Alexandria, Alexandria, Egypt
2. Department of Obstetrics and Gynecology, Aschaffenburg City Hospital, Aschaffenburg, Germany
3. Department of Obstetrics and Gynecology, University of Hannover, Hannover, Germany
4. Department of Obstetrics and Gynecology, Franziskus Hospital, Bielefeld, Germany