heshmatolah shahbazian professor of nephrology, diabetes and ckd research centers, ahvaz jundishapour university of medical sciences, ahvaz, ir iran azita zafar mohtashami assisstant professor of nephrology, department of internal medicine, shaheed rahimi hospital, lorestan university of medical sciences, khorramabad, ir iran; department of internal medicine, shaheed rahimi hospital, lorestan university of medical sciences, khorramabad, ir iran. tel/fax: +98-663369539 seyed seifollah belladi musavi assisstant professor of nephrology, ahvaz jundishapour university of medical sciences, ahvaz, ir iran mahnaz danesh assisstant professor of nephrology, ahvaz jundishapour university of medical sciences, ahvaz, ir iran gholam reza lashkarara general physician, mph, lorestan university of medical sciences, khorramabad, ir iran