[1] Harvard Med Sch, Dept Emergency Med, Beth Israel Deaconness Med Ctr, Boston, MA 02115 USA
[2] Harvard Med Sch, Dept Emergency Med, Massachusetts Gen Hosp, Harvard TH Chan Sch Publ Hlth, Boston, MA 02115 USA
[3] Univ Calif San Francisco, Dept Emergency Med, San Francisco, CA 94143 USA
[4] Harvard Univ, Harvard Humanitarian Initiat, TH Chan Sch Publ Hlth, Cambridge, MA 02138 USA
[5] Washington Univ, Dept Emergency Med, St Louis, MO 63110 USA
[6] Univ Minnesota, Dept Emergency Med, Hennepin Cty Hosp, Minneapolis, MN USA
[7] Hlth & Human Serv Agcy, Cty San Diego, Emergency Med Serv, San Diego, CA USA
[8] Univ Calif Irvine, Dept Emergency Med, Orange, CA 92668 USA
[9] Univ Colorado, Dept Emergency Med, Denver, CO 80202 USA
[10] Kaiser Permanente Woodland Hills Med Ctr, Los Angeles, CA USA
[11] Harvard Med Sch, Dept Emergency Med, Brigham & Womens Hosp, Boston, MA 02115 USA
[12] Harvard Med Sch, Ctr Surg & Publ Hlth, Brigham & Womens Hosp, Boston, MA 02115 USA