ali taghizadieh tuberculosis and lung disease research center, tabriz university of medical sciences, tabriz, ir iran farzad rahmani road traffic injury research center, tabriz university of medical sciences, tabriz, ir iran; road traffic injury research center, tabriz university of medical sciences, tabriz, ir iran. tel: +98-4135498144, fax: +98-4135412151 hassan soleimanpour cardiovascular research center, tabriz university of medical sciences, tabriz, ir iran hadi aminifazl student’s research committee, tabriz university of medical sciences, tabriz, ir iran