1. Department of Emergency Medicine, Dalhousie University, Saint John, New Brunswick, Canada
2. Discipline of Emergency Medicine, Memorial University, Saint John, New Brunswick, Canada
3. Department of Emergency Medicine, Horizon Health Network, Saint John, New Brunswick, Canada
4. Department of Diagnostic Imaging, Queen Elizabeth II Health Sciences Centre, Halifax, Nova Scotia, Canada
5. Department of Emergency Medicine, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle, United Kingdom