1 Department of Obstetrics and Gynecology, Maternal-Fetal Neonatal Research Center, Valiasr Hospital, Tehran University of Medical Sciences, Tehran, Iran.
2 Department of Obstetrics and Gynecology, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran.
3 Student Research Committee, School of Medicine, Alborz University of Medical Sciences, Karaj, Iran.
4 Department of Community Medicine, School of Medicine, Alborz University of Medical Sciences, Karaj, Iran.