[1] Indiana Univ Sch Med, Div Acute Care Surg, Dept Surg, Indianapolis, IN 46202 USA
[2] Johns Hopkins Univ, Sch Med, Dept Surg, Room 6107C Sheikh Zayed,1800 Orleans St, Baltimore, MD 21287 USA
[3] Johns Hopkins Univ, Sch Med, Dept Anesthesiol & Crit Care Med, Baltimore, MD 21205 USA
[4] Johns Hopkins Univ, Sch Med, Dept Emergency Med, Baltimore, MD USA
[5] Johns Hopkins Med, Armstrong Inst Patient Safety & Qual, Baltimore, MD USA
[6] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Hlth Policy & Management, Baltimore, MD USA