Document Type : Original Article
Authors
1 Phoniatrics unit at Hearing and Speech institute
2 Phoniatrics unit, otorhinlaryngology department, Faculty of Medicine, Ain Shams University
3 Otorhinolaryngology department, Phoniatrics units, faculty of medicine, Ain Shams University
4 Phoniatric depatment at Hearing and Speech Institute
5 Otorhinolaryngology department, Phoniatrics unit, Faculty of Medicine, Ain Shams University
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