[1] Boston Childrens Hosp, Div Emergency Med, Boston, MA 02115 USA
[2] Emory Univ, Sch Med, Div Pediat Emergency Med, Childrens Healthcare Atlanta, Atlanta, GA USA
[3] Ann & Robert H Lurie Childrens Hosp Chicago, Div Pediat Emergency Med, Chicago, IL 60611 USA
[4] Hennepin Healthcare, Div Pediat Crit Care, Minneapolis, MN USA