1. Department of Otorhinolaryngology-Head and Neck Surgery; Zagazig Egypt
2. ENT Department, King Abdullah Medical City; Makkah Saudi Arabia
3. Department of Radiology and Nuclear Medicine; Zagazig Egypt
4. Faculty of Medicine, Zagazig University; Zagazig Egypt
5. Department of Otolaryngology-Head and Neck Surgery, Weill Cornell Medical College; New York New York U.S.A