[1] Boston Med Ctr, Dept Emergency Med, Boston, MA USA
[2] Hennepin Cty Med Ctr, Dept Emergency Med, Minneapolis, MN 55415 USA
[3] Cleveland Clin, Dept Internal Med, Cleveland, OH 44106 USA
[4] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[5] Johns Hopkins Univ Hosp, Dept Emergency Med, Baltimore, MD 21287 USA
[6] Brigham & Womens Hosp, Dept Emergency Med, 75 Francis St, Boston, MA 02115 USA
[7] Boston Univ, Sch Med, Boston, MA 02118 USA
[8] Boston Univ, Ctr Global Hlth & Dev, Boston, MA 02215 USA