Document Type : Original Article
Authors
1 Resident at phoniatric unit ENT department zagazig university Hospitals
2 Professor of phoniatrics, E.N.T. Department - Faculty of Medicine, Zagazig University
3 Professor of Chest Diseases, Chest Department - Faculty of Medicine, Zagazig University
4 Assistant professor of Phoniatrics, ENT Department- Faculty of Medicine, Zagazig University
5 Lecturer of phoniatrics, E.N.T Department- Faculty of Medicine, Zagazig University
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