Document Type : Original Article
Authors
1 Otorhinolaryngology department, Tanta University,Tanta, Egypt
2 Nat and Sheila Harris Professor Chief, Rhinology, Allergy, and Endoscopic Skull Base Surgery Otolaryngology/Head and Neck Surgery University of North Carolina at Chapel Hill Chapel Hill, NC, USA
3 Otorhinolaryngology department, Tanta University, Tanta, Egypt
4 Department of Otorhinolaryngology, Faculty of Medicine, Tanta University, Tanta, Egypt.
5 Public Health and Community Medicine Department, Faculty of Medicine, Tanta University, Tanta, Egypt.
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