Document Type : Original Article
Authors
1 Professor of otorhinolaryngology department Faculty of Medicine Benha university
2 Assistant lecturer of otorhinolarygology Faculty of medicine –Benha university
3 Lecturer of Phoniatrics & Consultant of Phoniatrics, Unit of Phoniatrics, Otorhinolaryngology Department, Faculty of Medicine, Benha University Hospitals, Cairo, Egypt.
4 Assistant Professor of otorhinolaryngology department Faculty of Medicine Benha university
Abstract
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