[1] Department of Otolaryngology, Ismailia General Hospital, Faculty of Medicine, Suez Canal University, Ismailia
[2] Department of Otolaryngology - Head & Neck Surgery (ENT), Faculty of Medicine, Suez Canal University, Round Road, Ismailia
[3] Department of Microbiology and Immunology, Faculty of Medicine, Suez Canal University, Ismailia
[4] Department of Community Medicine, Faculty of Medicine, Suez Canal University, Ismailia