1. Department of Obstetrics and Gynecology, Faculty of Medicine, Fayoum University, Fayoum, Egypt
2. Department of Obstetrics and Gynecology, Faculty of Medicine, Ain Shams University, Cairo, Egypt
3. Department of Obstetrics and Gynecology, Faculty of Medicine, Al Azhar University, Cairo, Egypt
4. Department of Obstetrics and Gynecology, Armed Forces College of Medicine, Cairo, Egypt
5. Kasralainy, Faculty of Medicine, Cairo University, Cairo, Egypt
6. Department of Obstetrics and Gynecology, Faculty of Medicine, Assiut University, Assiut, Egypt
7. Department of Obstetrics and Gynecology, Faculty of Medicine, Al Azhar University for Girls, Cairo, Egypt.