1. Department of Nursing, School of Nursing and Midwifery, Sabzevar University of Medical Sciences, Sabzevar, Iran
2. Department of Epidemiology & Biostatistics, School of Public Health, Sabzevar University of Medical Sciences, Sabzevar, Iran
3. Department of Nursing, Nursing and Midwifery School, Iranian Research Center on Healthy Aging, Sabzevar University of Medical Sciences, Sabzevar, Iran