1. Division of Emergency Medicine, Medical University of South Carolina, Charleston, SC 29425, USA
2. Department of Emergency Medicine, University of Cincinnati, Cincinnati, Ohio 45267, USA
3. Nexus DX, San Diego, CA 92121, USA
4. Division of Cardiology, McMaster University, Hamilton, ON, Canada L8S 4L8
5. Department of Family Medicine, Sunnybrook and Women’s College Health Sciences Centre, Toronto, ON, Canada M4N 3M5