narges mohammadsalehi department of research vice chancellor, health policy and promotion research center, qom university of medical sciences, qom, ir iran abolfazl mohammadbeigi department of epidemiology and biostatistics, health policy and promotion research center, school of health, qom university of medical sciences, qom, ir iran; department of epidemiology and biostatistics, health policy and promotion research center, school of health, qom university of medical sciences, qom, ir iran. tel/fax: +98-2537833361 rahmatollah jadidi department of education development center (edc), arak university of medical sciences, arak, ir iran zohreh anbari department of education development center (edc), arak university of medical sciences, arak, ir iran ebrahim ghaderi social determinants of health research center, kurdistan university of medical sciences, sanandaj, ir iran mojtaba akbari school of medicine, isfahan university of medical sciences, isfahan, ir iran