1. Otorhinolaryngology Research Center, Department of Otolaryngology-Head and Neck Surgery, Amir Alam Hospital, Tehran University of Medical Sciences, Tehran, Iran
2. Department of Community Medicine, Tehran University of Medical Sciences, Tehran, Iran
3. Department of Internal Medicine (Infectious Diseases division), Amir Alam Hospital, Tehran University of Medical Sciences, Tehran, Iran
4. Department of Internal Medicine (Neurology division), Amir Alam Hospital, Tehran University of Medical Sciences, Tehran, Iran