Affiliation: | 1. Department of Emergency Medicine, Boston Medical Center and Boston University School of Medicine, Boston, MA;2. Department of Emergency Medicine, University of California–San Francisco School of Medicine, San Francisco, CA;3. Department of Emergency Medicine, Massachusetts General Hospital, Boston, MA;4. Department of Emergency Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA;5. Department of Emergency Medicine, Allegheny Health Network, Pittsburgh, PA |