1. Department of Obstetrics and Gynecology, Mobini Hospital; Sabzevar University of Medical Sciences; Sabzevar Iran
2. Department of Midwifery; Sabzevar University of Medical Sciences; Sabzevar Iran
3. The Collaboration Center of Meta-Analysis Research; Torbat Heydariyeh University of Medical Sciences, Torbat Heydariyeh; Tehran Iran
4. Department of Perinatology; Medical School/Tehran University of Medical Sciences; Tehran Iran