[1] Brown Univ, Alpert Med Sch, Dept Emergency Med, Providence, RI 02912 USA
[2] Boston Univ, Sch Med, Boston Med Ctr, Dept Emergency Med, Boston, MA 02118 USA
[3] Johns Hopkins Univ, Sch Med, Dept Emergency Med, Baltimore, MD USA
[4] Thomas Jefferson Univ, Dept Emergency Med, Sidney Kimmel Med Coll, Philadelphia, PA 19107 USA
[5] Yale Univ, Dept Emergency Med, New Haven, CT USA
[6] Hofstra Univ, Sch Med, Dept Emergency Med, Hempstead, NY 11550 USA
[7] Emory Univ, Sch Med, Dept Emergency Med, Atlanta, GA USA
[8] Univ New Mexico, Dept Emergency Med, Albuquerque, NM 87131 USA
[9] NYU, Sch Med, Dept Emergency Med, New York, NY USA
[10] Univ Louisville, Dept Emergency, Louisville, KY 40292 USA
[11] Univ Maryland, Sch Med, Dept Emergency Med, Baltimore, MD 21201 USA
[12] Baystate Med Ctr, Dept Emergency Med, Springfield, MA USA