1 Sina Trauma and Surgery Research Center, Tehran University of Medical Sciences, Tehran, Iran. Electronic address: psalamati@tums.ac.ir.
2 PhD student, Sina Trauma and Surgery Research Center, Tehran University of Medical Sciences, Tehran, Iran; Department of Midwifery, Toyserkan Branch, Islamic Azad University, Toyserkan, Iran. Electronic address: Ghodsi2003@yahoo.com.
3 Sina Trauma and Surgery Research Center, Tehran University of Medical Sciences, Tehran, Iran. Electronic address: v_rahimi@sina.tums.ac.ir.