1. Department of Obstetrics and Gynecology, Assiut School of Medicine, Assiut, Egypt
2. Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Hospital, Houston, TX, USA
3. Department of Obstetrics and Gynecology, University hospitals of Coventry and Warwickshire, UK
4. Department of Obstetrics and Gynecology, Ege University School of Medicine, Izmir, Turkey
5. Department of Obstetrics and Gynecology, Maternity Hospital, Alexandria, Egypt
6. Department of Obstetrics and Gynecology, Aswan University, Aswan, Egypt