1. Department of Anesthesiology and Resuscitation, Imam Reza Educational Hospital, Mashad University of Medical Sciences, Mashad, Iran
2. Department of Otorhinolaryngology–Head and Neck Surgery, Imam Reza Educational Hospital, Mashad University of Medical Sciences, Mashad, Iran
3. Department of Pathology, Imam Reza Educational Hospital, Mashad University of Medical Sciences, Mashad, Iran
4. Division of Head and Neck Surgery, Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA