[1] Yale Sch Med, Dept Pediat, New Haven, CT USA
[2] Yale Sch Med, Dept Emergency Med, New Haven, CT USA
[3] Univ Texas Austin, Austin Travis Cty EMS Syst, Austin, TX 78712 USA
[4] Univ Texas Austin, Dell Med Sch, Austin, TX 78712 USA
[5] San Marcos Hays Cty EMS Syst, San Marcos, TX USA
[6] EMS Children Innovat & Improvement Ctr, Houston, TX USA
[7] Univ Utah, Dept Pediat, Div Crit Care, Natl Emergency Med Serv Children Data Anal Resour, Salt Lake City, UT USA
[8] George Washington Univ, Sch Med, Dept Emergency Med, Washington, DC USA
[9] Childrens Natl Med Ctr, Washington, DC 20010 USA
[10] Harbor UCLA Med Ctr, Dept Emergency Med, Torrance, CA 90509 USA
[11] Harbor UCLA Med Ctr, Dept Pediat, Torrance, CA 90509 USA
[12] Univ Calif Los Angeles, David Geffen Sch Med, Dept Emergency Med, Los Angeles, CA 90095 USA
[13] Univ Calif Los Angeles, David Geffen Sch Med, Dept Pediat, Los Angeles, CA 90095 USA
[14] Emergency Med Serv Agcy, Dept Hlth Serv, Los Angeles, CA USA