1. School of Nursing and Midwifery, Sabzevar University of Medical Sciences, Sabzevar, Iran
2. Nursing and Midwifery Care Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
3. Department of Medical-Surgical Nursing, School of Nursing and Midwifery, Mashhad University of Medical Sciences, Mashhad, Iran
4. Department of Biostatistics, School of Public Health, Mashhad University of Medical Sciences, Mashhad, Iran
5. Department of Nursing, Nursing and Midwifery School, Iranian Research Center on Healthy Aging, Sabzevar University of Medical Sciences, Sabzevar, Iran