Document Type : Original Article
Authors
1 Otorhinolaryngology ,Head and Neck surgery department,Faculty of human medicine, Zagazig university,Egypt.
2 Otorhinolaryngology, head and Neck surgery, Faculty of human medicine, Egypt
3 Histology department, Faculty of human medicine, Zagazig university,Egypt
4 Otorhinolaryngology,Head and Neck surgery, Faculty of human medicine, Zagazig university, Egypt.
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