Document Type : Original Article
Authors
1 ENT department,faculty of medicine,Beni-suef university ,Egypt
2 Audiovestibular unit ,Department of otolaryngology,Kasr Al Ainy faculty of medicine, Cairo University
3 phoniatric unit, ENT department, Cairo University
4 Audiovestibular unit ,ENT department ,faculty of medicine ,Beni-Suef university
5 audiovestibular medicine unit ,ENT department,faculty of medicine ,Beni suef university.
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