[1] Harvard Med Sch, Dept Emergency Med, Massachusetts Gen Hosp, Boston, MA 02115 USA
[2] Harvard Med Sch, Div Emergency Med, Boston Childrens Hosp, Boston, MA 02115 USA
[3] Childrens Hosp Assoc, Lenexa, KS USA
[4] Childrens Hosp Pittsburgh, Div Pediat Emergency Med, Pittsburgh, PA USA
[5] Yale Sch Med, Sect Pediat Emergency Med, Dept Pediat, New Haven, CT USA
[6] Yale Sch Med, Sect Pediat Emergency Med, Dept Emergency Med, New Haven, CT USA
[7] Univ Calgary, Sect Pediat Emergency Med, Alberta Childrens Hosp Res Inst, Dept Pediat,Alberta Childrens Hosp,Cumming Sch Me, Calgary, AB, Canada
[8] Univ Calgary, Gastroenterol Sect, Alberta Childrens Hosp Res Inst, Dept Pediat,Alberta Childrens Hosp,Cumming Sch Me, Calgary, AB, Canada
[9] Childrens Hlth Syst Texas, Dallas, TX USA
[10] Univ Toronto, Hosp Sick Children, Div Pediat Med, Dept Pediat, Toronto, ON, Canada
[11] Emory Univ, Sch Med, Dept Pediat, Div Emergency Med, Atlanta, GA USA
[12] Emory Univ, Sch Med, Dept Emergency Med, Div Emergency Med, Atlanta, GA USA
[13] Cincinnati Childrens Hosp Med Ctr, Div Hosp Med, Dept Pediat, Cincinnati, OH 45229 USA
[14] Cincinnati Childrens Hosp Med Ctr, Div Infect Dis, Dept Pediat, Cincinnati, OH 45229 USA
[15] Northwestern Univ, Dept Pediat, Ann & Robert H Lurie Childrens Hosp Chicago, Div Emergency Med,Feinberg Sch Med, Chicago, IL 60611 USA