1. Department of Medicine, Division of Emergency Medicine; McMaster University; Hamilton Canada
2. Department of Medicine, Division of Cardiology; University of Toronto; Toronto Canada
3. Department of Medicine, Division of Cardiology; McMaster University, Hamilton, Canada; Population Health Research Institute; Hamilton Canada
4. Department of Medicine, Division of Emergency Medicine; McMaster University, Hamilton, Canada; Centre for Paramedic Education and Research, Hamilton Health Sciences; Hamilton Canada