1. Department of Nursing, Faculty of Nursing and Midwifery, Elderly Care Research CenterShahed UniversityTehran Iran
2. Deparment of Nursing, Faculty of NursingBaqiyatallah University of Medical SciencesTehran Iran
3. College of Human and Health SciencesSwansea UniversitySwansea UK
4. Faculty of Nursing and Health SciencesNord UniversityBodø Norway