1. Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine; King Saud University; Riyadh Kingdom of Saudi Arabia
2. Division of Otolaryngology-Head & Neck Surgery, Department of Surgery; Dalhousie University; Halifax Nova Scotia Canada
3. College of Pharmacy; Dalhousie University, 5968 College Street, PO Box 1500; Halifax NS B3H4R2 Canada