[1] Mashhad Univ Med Sci, Sch Nursing & Midwifery, Dept Midwifery, Student Res Comm, Mashhad 9137913199, Iran
[2] Shiraz Univ Med Sci, Maternal Fetal Med Res Ctr, Shiraz 7194634786, Iran
[3] Mashhad Univ Med Sci, Sch Nursing & Midwifery, Res Ctr Patient Safety, Dept Midwifery, Mashhad 9137913199, Iran
[4] Mashhad Univ Med Sci, Sch Hlth, Hlth Sci Res Ctr, Dept Biostat & Epidemiol, Mashhad 9137913199, Iran
[5] Shahid Beheshti Univ Med Sci, Med Eth & Law Res Ctr, Tehran 1516745811, Iran
[6] Univ Maryland, Dept Sociol & Anthropol, Baltimore, MD 21250 USA