[1] Georgetown Univ, Dept Emergency Med, Washington, DC 20007 USA
[2] Indiana Univ, Sch Med, Dept Emergency Med, Indianapolis, IN USA
[3] Methodist Hosp, Clarian Hlth Partners, Emegency Med & Trauma Ctr, Indianapolis, IN USA
[4] Univ Rochester, Med Ctr, Dept Emergency Med, Rochester, NY 14642 USA