zahra tagharrobi department of health and management nursing, kashan university of medical sciences, kashan, ir iran; corresponding author: zahra tagharrobi, department of health and management nursing, kashan university of medical sciences, kashan, ir iran. tel.: +98-3615550021, fax: +98-3615556633, e-mail:. negin masoudi alavi trauma nursing research center, kashan university of medical sciences, kashan, ir iran esmail fakharian department of neurosurgery, kashan university of medical sciences, kashan, ir iran fakhrossadat mirhoseini department of anesthesiology, kashan university of medical sciences, kashan, ir iran sayyed asghar rasoulinejad department of health and management nursing, kashan university of medical sciences, kashan, ir iran hossein akbari department of statistics and public health, kashan university of medical sciences, kashan, ir iran