Department of Otorhinolaryngology-Head and Neck Surgery, Faculty of Medicine, Alexandria University, El-Khartoum Square, Azarita Medical Campus, Alexandria, 21542, Egypt.
European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery