mohammad sharafkhani student research committee, department of medical-surgical nursing, school of nursing and midwifery, mashhad university of medical sciences, mashhad, ir iran mohammad reza armat student research committee, department of medical-surgical nursing, school of nursing and midwifery, mashhad university of medical sciences, mashhad, ir iran amir emami zeydi student research committee, department of medical-surgical nursing, school of nursing and midwifery, mashhad university of medical sciences, mashhad, ir iran; student research committee, department of medical-surgical nursing, school of nursing and midwifery, mashhad university of medical sciences, mashhad, ir iran. tel: +98-9355952357, fax: +98-5138591511