1. Faculty of Medicine, Tartous University , Tartous, Syrian Arab Republic
2. Department of Obstetrics and Gynecology, National Maternity Hospital , Aleppo, Syrian Arab Republic
3. Department of Obstetrics and Gynecology, Maternity Hospital , Damascus, Syrian Arab Republic
4. Faculty of Medicine, University of Khartoum , Khartoum, Sudan
5. Faculty of Medicine, Al Andalus University of Medical Science , Tartous, Syrian Arab Republic
6. Department of Obstetrics and Gynecology, Al-Assad Hospital , Hama, Syrian Arab Republic