[1] UPMC, Childrens Hosp Pittsburgh, Dept Emergency Med, Pittsburgh, PA USA
[2] Stanford Univ, Sch Med, Dept Emergency Med, Palo Alto, CA 94304 USA
[3] Natl Childrens Hosp, Dept Emergency Med & Trauma Serv, Washington, DC USA
[4] Dell Med Sch, Dept Pediat, Austin, TX USA
[5] Univ Louisville, Norton Childrens Hosp, Sch Med, Div Emergency Med,Dept Pediat, Louisville, KY USA
[6] Univ Cincinnati, Coll Med, Dept Pediat, Cincinnati, OH USA
[7] Cincinnati Childrens Hosp Med Ctr, Div Emergency Med, Cincinnati, OH 45229 USA
[8] Childrens Hosp Colorado, Sect Pediat Emergency Med, Dept Pediat, Aurora, CO USA
[9] UCSF Benioff Childrens Hosp, Dept Emergency Med, San Francisco, CA USA