1. Department of Obstetrics and Gynaecology, Faculty of Medicine, Assiut University, Assiut, Egypt;
2. Department of Obstetrics and Gynaecology, University of Nottingham, Royal Derby Hospital, Derby, United Kingdom;
3. Kasr Al-Ainy Faculty of Medicine, Cairo University, Cairo, Egypt;
4. Derby Teaching Hospitals NHS Foundation Trust, Derby, United Kingdom;
5. Department of Obstetrics and Gynaecology, Faculty of Medicine, Beni-Suef University, Cairo, Egypt;
6. Department of Obstetrics and Gynaecology, Faculty of Medicine, Cairo University, Cairo, Egypt