1. Department of Emergency Medicine, Brown University Warren Alpert School of Medicine, Providence, RI, USA
2. Department of Emergency Medicine, The George Washington University, Washington, DC, USA
3. Department of Emergency Medicine, Boston Medical Center, Boston, MA, USA
4. Department of Emergency Medicine, Yale Medical School, New Haven, CT, USA
5. Department of Emergency Medicine, University of Arizona Colleges of Medicine and Public Health, Tucson, AZ, USA
6. Department of Emergency Medicine, University of Wisconsin - Madison, Madison, WI, USA