1. Uterine Bleeding Research Center, Semnan University of Medical Sciences, Semnan, Iran
2. Department of Obstetrics and Gynecology, Faculty of Medicine, Shahid Sadughi University of Medical Sciences, Yazd, Iran
3. Department of Obstetrics and Gynecology, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran
4. Department of Obstetrics and Gynecology, Kurdistan University of Medical Sciences, Sanandaj, Iran