1. Department of Otolaryngology, University of ManitobaWinnipeg Manitoba Canada
2. Department of SurgeryDivision of Otolaryngology–Head and Neck Surgery, University of AlbertaEdmonton Alberta Canada
3. Department of Emergency MedicineUniversity of AlbertaEdmonton Alberta Canada
4. School of Public Health, University of AlbertaEdmonton Alberta Canada
5. University College Cork Cork Ireland