1. From the Department of Emergency Medicine Harvard Medical School Massachusetts General Hospital Boston MA
2. the Department of Emergency Medicine UCLA Olive‐View Medical Center David Geffen School of Medicine at UCLA Sylmar CA
3. the Department of Emergency Medicine Advocate Christ Medical Center Oaklawn IL
4. the University of Illinois Chicago Chicago IL
5. and the Department of Emergency Medicine David Geffen School of Medicine at UCLA UCLA Ronald Reagan Medical Center Los Angeles CA