[1] Brown Univ, Warren Alpert Med Sch, Dept Emergency Med, Providence, RI 02912 USA
[2] USF Morsani Coll Med, Dept Emergency & Hosp Med, Lehigh Valley Hlth Network, Allentown, PA 33612 USA
[3] Univ Alabama Birmingham, Dept Emergency Med, Birmingham, AL USA
[4] Univ Massachusetts, Med Sch Baystate Springfield, Dept Emergency Med, Springfield, MA USA