1. Department of Nursing, Faculty of Nursing and Midwifery, Shahed University; Tehran Iran
2. Department of Nursing, Faculty of Nursing and Midwifery, Elderly Care Research Center, Shahed University; Tehran Iran
3. Faculty of Nursing and Health Sciences, Nord University; NO-8049, Bodø Norway
4. Faculty of Nursing, Baqiyatallah University of Medical Science; Tehran Iran
5. College of Nursing, Montana State University; Bozeman, MT USA