fatemeh zeraati department of pharmacology, hamadan university of medical sciences, hamadan, ir iran; department of pharmacology, hamadan university of medical sciences, hamadan, ir iran.tel: +98-9183122063, fax: +98-8118226035 malihe araghchian department of pharmacology, hamadan university of medical sciences, hamadan, ir iran farzaneh esna-ashari departmentof community medicine, hamadan university of medical sciences, hamadan ir iran mohammad mehdi fazlian medical school hamadan university of medical sciences, hamedan ir iran sima torabian medical school hamadan university of medical sciences, hamedan ir iran nazanin fallah medical school hamadan university of medical sciences, hamedan ir iran