1 Department of Obstetrics and Gynaecology, Maternal-Fetal Neonatal Research Centre, Valiasr Hospital, Tehran University of Medical Sciences, Tehran, Iran.
2 Department of Obstetrics and Gynaecology, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran.
3 School of Medicine, Alborz University of Medical Sciences, Karaj, Iran.
4 Department of Urogynaecology, Fasa University of Medical Sciences, Fasa, Iran.