1. Sinus and Surgical Endoscopic Research Center
2. Department of Otorhinolaryngology; Imam Reza Educational Hospital
3. Department of Neurology; Ghaem Educational Hospital
4. Ghaem Educational Hospital, Mashhad University of Medical Sciences, Mashhad
5. Otorhinolaryngology Research Center; Department of Otorhinolaryngology; Imam Khomeini Educational Complex Hospital, Valiasr Hospital, Tehran University of Medical Sciences; Tehran Iran
6. Department of Otorhinolaryngology