1. Department of Emergency Medicine, St. Francis Hospital, School of Medicine University of South Carolina Columbus South Carolina USA
2. Department of Emergency Medicine, School of Medicine University of Arizona Tucson Arizona USA
3. Department of Emergency Medicine, UCLA David Geffen School of Medicine UCLA Ronald Reagan Medical Center Los Angeles California USA
4. Department of Emergency Medicine, Harbor‐UCLA Medical Center, David Geffren School of Medicine UCLA Los Angeles California USA
5. Michigan State University‐East Lansing East Lansing Michigan USA