1. Department of Obstetrics and Gynecology, School of Medicine and Allied Medical Sciences, Ardabil University of Medical Sciences, Ardabil, Iran.
2. Anatomy and Biology Department, Medicine Faculty, Shahid Beheshti University of Medical Science, Tehran, Iran.
3. Department of Anesthesiology, Medicine Faculty, Tabriz University of Medical Sciences, Tabriz, Iran.
4. Obstetrics and Gynecology Department, Medicine Faculty, Tabriz University of Medical Science, Tabriz, Iran.