Affiliation: | 1. Department of Obstetrics and Gynecology, Sana''a University, Sana’a, Yemen;2. Department of Obstetrics and Gynecology, Saudi Hospital, Hajjah, Yemen;3. Department of Community Medicine, Sana''a University, Sana’a, Yemen;4. Department of Obstetrics and Gynecology, Faculty of Medicine, University of Khartoum, Khartoum, Sudan |