nozar dorestan department of surgery, school of medicine, ahvaz jundishapur university of medical sciences, ahvaz, ir iran mehrdad dargahi-malamir department of internal medicine, ahvaz jundishapur university of medical sciences, ahvaz, ir iran sara bahadoram department of pediatrics, imam khomeini hospital complex, tehran university of medical sciences, tehran, ir iran mohammad bahadoram medical student research committee and social determinant of health research center, ahvaz jundishapur university of medical sciences, ahvaz, ir iran; medical student research committee and social determinant of health research center, ahvaz jundishapur university of medical sciences, ahvaz, ir iran. tel: +98-6133367543; +98-9380115943