Affiliation: | 1. Division of Otolaryngology, St. Paul's Sinus Centre, University of British Columbia, Vancouver, BC, Canada;2. Clínica Alemana de Santiago, Facultad de Medicina Clínica Alemana, Universidad del Desarrollo, Santiago, Chile;3. Department of Otolaryngology – Head and Neck Surgery, King Abdulaziz University Hospital, King Saud University, Riyadh, Saudi Arabia;4. Department of Otolaryngology, Hospital Espa?ol de Mexico, Mexico City, Mexico |