[1] Univ Southern Calif, Keck Sch Med, Dept Emergency Med, Los Angeles, CA 90089 USA
[2] Univ Southern Calif, Keck Sch Med, Int Div Emergency Med, Los Angeles, CA 90089 USA
[3] Univ Southern Calif, Keck Sch Med, Emergency Med, Los Angeles, CA 90089 USA
[4] Georgetown Public Hosp Corp, Masters Programme Emergency Med, Georgetown, Guyana
[5] Vanderbilt Univ, Emergency Med, 221 Kirkland Hall, Nashville, TN 37235 USA