nader saki department of otolaryngology, head and neck surgery, hearing and speech research centre, ahvaz jundishapur university of medical sciences, ahvaz, ir iran mojtaba jahani department of otolaryngology, hearing and speech research centre, ahvaz jundishapur university of medical sciences, ahvaz, ir iran alireza samarbaf department of virology, health research institute, infectious and tropical diseases research center, ahvaz jundishapur university of medical sciences, ahvaz, ir iran gholam abbas kaydani department of otolaryngology, hearing and speech research centre, ahvaz jundishapur university of medical sciences, ahvaz, ir iran soheila nikakhlagh department of infectious diseases, health research institute, infectious and tropical diseases research center, ahvaz jundishapur university of medical sciences, ahvaz, ir iran; department of infectious diseases, health research institute, infectious and tropical diseases research center, ahvaz jundishapur university of medical sciences, ahvaz, ir iran. tel: +98-6133738283, fax: +98-6132921838 malek kenani department of pathology, health research institute, infectious and tropical diseases research center, ahvaz jundishapur university of medical sciences, ahvaz, ir iran

J K Apple M E Dikeman J E Minton R M McMurphy M R Fedde D E Leith J A Unruh