[1] Univ New Mexico, Hlth Sci Ctr, Dept Emergency Med, Albuquerque, NM 87131 USA
[2] Baylor Coll Med, Dept Pediat, Sect Emergency Med, Houston, TX 77030 USA
[3] Texas Childrens Hosp, Houston, TX 77030 USA
[4] Univ Pittsburgh, Dept Pediat, Med Ctr, Childrens Hosp Pittsburgh,Div Emergency Med Serv, Pittsburgh, PA 15260 USA
[5] Univ Pittsburgh, Emergency Dept, Med Ctr, Childrens Hosp Pittsburgh, Pittsburgh, PA 15260 USA
[6] Childrens Hosp New Orleans, Dept Emergency Med, New Orleans, LA USA
[7] Louisiana State Univ Hlth New Orleans, New Orleans, LA USA
[8] George Washington Univ, Sch Med & Hlth Sci, Dept Pediat, Washington, DC 20052 USA
[9] George Washington Univ, Sch Med & Hlth Sci, Dept Emergency Med, Washington, DC 20052 USA
[10] Childrens Natl Med Ctr, Div Emergency Med, Washington, DC 20010 USA
[11] Univ Calif Los Angeles, David Geffen Sch Med, Dept Emergency Med, Los Angeles, CA 90095 USA
[12] Univ Calif Los Angeles, David Geffen Sch Med, Dept Pediat, Los Angeles, CA 90095 USA
[13] Harbor UCLA Med Ctr, Los Angeles, CA USA
[14] San Marcos Hays Cty Emergency Med Serv, San Marcos, TX USA
[15] Austin Travis Cty Emergency Med Serv Syst, Austin, TX USA
[16] Univ Texas Austin, Dept Pediat, Dell Med Sch, Austin, TX 78712 USA
[17] Univ Colorado, Sch Med, Dept Pediat, Aurora, CO USA
[18] North Mem Hlth Hosp, Level 1 Adult Trauma Ctr, Minneapolis, MN USA
[19] North Mem Hlth Hosp, Level 2 Pediat Trauma Ctr, Minneapolis, MN USA
[20] Denver Hlth Med Ctr, Dept Pediat Emergency Med, Denver, CO USA
[21] Denver Hlth Med Ctr, Urgent Care Ctr, Denver, CO USA
[22] Maryland Inst Emergency Med Serv Syst, Emergency Med Serv Children, Baltimore, MD 21201 USA
[23] Ohio State Univ, Dept Pediat, Nationwide Childrens Hosp, Div Emergency Med, Columbus, OH 43210 USA
[24] Ohio State Univ, Coll Med, Columbus, OH 43210 USA