1. Department of Emergency Medicine, Greater Los Angeles Veterans Affairs Hospital David Geffen School of Medicine, UCLA Los Angeles California USA
2. Department of Emergency Medicine, Harbor–UCLA Medical Center David Geffen School of Medicine, UCLA Los Angeles California USA
3. Department of Emergency Medicine Loma Linda University Health Loma Linda California USA
4. Department of Ophthalmology University of California Davis California USA
5. Division of Emergency Medicine, Department of Medicine Faculty of Health Sciences, McMaster University Hamilton Ontario Canada
6. McMaster Education, Research, Innovation and Theory Program Faculty of Health Sciences, McMaster University Hamilton Ontario Canada
7. School of Medicine Toronto Metropolitan University Toronto Ontario Canada