1. Center for Health Related Social and Behavioral Sciences Research, Shahroud University of Medical Sciences, Shahroud, Iran
2. Ophthalmic Epidemiology Research Center, Shahroud University of Medical Sciences, Shahroud, Iran
3. Department of Nursing, School of Nursing and Midwifery, Shahroud University of Medical Sciences, Shahroud. Iran
4. Clinical Research Development Unit, Imam Hossein Hospital, Shahroud University of Medical Sciences, Shahroud, Iran