Affiliation: | 1. School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina;2. Department of Emergency Medicine, Cooper University Hospital, Camden, New Jersey;3. Department of Emergency Medicine, William Beaumont Hospital, Royal Oak, Michigan;4. Department of Emergency Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina;5. Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina |