1. Maternal-Fetal Medicine Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
2. Student Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran
3. Health Policy Research Center, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran
4. Department of Obstetrics and Gynecology, Shiraz University of Medical Sciences, Shiraz, Iran
5. Department of Obstetrics and Gynecology, Mashhad University of Medical Sciences, Mashhad, Iran