1. Department of Obstetrics and Gynaecology, Armed Forces Hospitals Southern Region, Khamis Mushayt, Saudi Arabia;
2. Department of Obstetrics and Gynaecology, Benha University, Benha, Egypt;
3. Department of Obstetrics and Gynaecology, Ain Shams University, Cairo, Egypt;
4. Department of Obstetrics and Gynaecology, Zagazig University, Zagazig, Egypt;
5. Department of Obstetrics and Gynaecology, Assiut University, Assiut, Egypt