[1] Univ Vermont, Dept Surg & Pediat, Div Emergency Med, Larner Coll Med, Burlington, VT 05401 USA
[2] Univ Vermont, Dept Surg & Med, Div Emergency Med & Crit Care, Larner Coll Med, Burlington, VT 05401 USA
[3] Univ Pittsburgh, UPMC Childrens Hosp Pittsburgh, Dept Pediat, Div Pediat Emergency Med,Sch Med, Pittsburgh, PA 15261 USA
[4] Univ Vermont, Dept Surg, Div Emergency Med, Larner Coll Med, Burlington, VT 05401 USA
[5] Univ Pittsburgh, UPMC Childrens Hosp Pittsburgh, Dept Pediat, Div Infect Dis,Sch Med, Pittsburgh, PA 15261 USA
[6] Univ Pittsburgh, UPMC Childrens Hosp Pittsburgh, Dept Pediat, Div Hematol Oncol,Sch Med, Pittsburgh, PA 15261 USA