1. Department of Obstetrics and Gynecology, City Hospital of Aschaffenburg, Teaching Hospital of the Julius, Maximilians University Würzburg, Aschaffenburg, Germany
2. Department of Obstetrics and Gynecology, University of Alexandria, Alexandria, Egypt
3. Department of Obstetrics and Gynecology, University of Debrecen, Debrecen, Hungary
4. Department of Obstetrics and Gynecology, GPR Hospital Rüsselsheim, Rüsselsheim, Germany