1 | Department of Midwifery and Reproductive Health, faculty of Nursing and Midwifery, Tehran University of Medical Sciences, Tehran, Iran |
2 | Department of Midwifery, Faculty of Nursing and Midwifery, Member of mother & child care research center, Hamadan University of Medical Sciences and Health Services, Hamadan, Iran |
3 | Department of Midwifery, faculty of Nursing and Midwifery, Ilam University of Medical Sciences, Ilam, Iran |
4 | Department of Biostatistics Epidemiology, Faculty of Medicine, Tarbiat Modares University, Tehran, Iran |