1. Obstetrics and Gynecology Department, Zagazig University, Zagazig, Sharkia 44511, Egypt
2. Obstetrics and Gynecology Department, Kasr Al Ainy School of Medicine, Cairo University, El Saraya St., Cairo 11562, Egypt
3. Obstetrics and Gynecology Department, Mansoura University, Mansoura, Dakahlia 35516, Egypt
4. Obstetrics and Gynecology Department, Alexandria University, Alexandria 21523, Egypt