Document Type : Original Article
Authors
1 Phoniatrics unit, ENT department, faculty of medicine, Minia university ,
2 Department of Otolaryngology, Minia faculty of Medicine at Minia University, Minia, Egypt
3 ENT department, Faculty of Medicine, Minia university, Minia , Egypt
4 lecturer of phoniatrics, ENT, faculty of medicine, Minia university
Abstract
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