1. Department of Obstetrics and Gynecology, Faculty of Medicine, Isfahan University of Medical Science, Isfahan, Iran
2. Department of Obstetrics and Gynecology, Bushehr University of Medical Sciences, Bushehr, Iran
3. Department of Obstetrics and Gynecology, School of Medicine, Mahdyieh Hospital, Shahid Beheshti University of Medical Science, Tehran, Iran
4. Department of Obstetrics and Gynecology, School of Medicine, Shohada Hospital, Shahid Beheshti University of Medical Science, Tehran, Iran