hamid abousaidi department of infectious disease, rafsanjan university of medical sciences, rafsanjan, ir iran omid rezahosseini department of infectious and tropical diseases, imam khomeini hospital complex, tehran university of medical sciences, tehran, ir iran; department of infectious and tropical diseases, imam khomeini hospital complex, tehran university of medical sciences, tehran, ir iran. tel: +98-9363837859, fax: +98-2166581598 reza bidaki research center of addiction and behavioral sciences, shahid sadoughi university of medical sciences, yazd, ir iran mahmood sheikh fathollahi department of social medicine and environment research center, rafsanjan university of medical sciences, rafsanjan, ir iran hamid reza goodarzi nejad tehran heart center, tehran university of medical sciences, tehran, ir iran golam hossein hassan shahi department of hematology, rafsanjan university of medical sciences, rafsanjan, ir iran