Author/Authors :
jalilian, nasrin kermanshah university of medical sciences - school of medicine - dept. of obstetrics and gynecology, ايران , pourmirza kalhori, reza kermanshah university of medical sciences, - school of paramedics - dept. of emergency medicine, ايران , jalilian, nahid kermanshah university of medical sciences - education development center, ايران , memar eftekhari, lida kermanshah university of medical sciences - education development center, ايران