Document Type : Original Article
Authors
1 Audiovestibular unit, Otolaryngology department, Faculty of Medicine, Zagazig University.
2 Phoniatric unit
3 Phoniatric unit, Otolaryngology department Faculty of Medicine, Benha University.
4 Audiovestibular Medical Unit, ENT department ,Faculty of Medicine , Zagazig University ,Sharkia , Egypt.
Abstract
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