1. School of Nursing and Midwifery, Sabzevar University of Medical Sciences, Sabzevar, Iran
2. School of Nursing and Midwifery, Shahroud University of Medical Sciences, Shahroud, Iran
3. Department of Biostatistics, Sabzevar University of Medical Sciences, Sabzevar, Iran
4. School of Nursing, Kashmar Center of Higher Health Education, Mashhad University of Medical Sciences, Mashhad, Iran
5. Department of Nursing, School of Nursing and Midwifery, Sabzevar University of Medical Sciences, Sabzevar, Iran