[1] Boston Childrens Hosp, Div Emergency Med, Boston, MA 02115 USA
[2] Baylor Coll Med, Sect Pediat Emergency Med, Houston, TX 77030 USA
[3] Baylor Coll Med, Sect Pediat Infect Dis, Houston, TX 77030 USA
[4] Alberta Childrens Prov Gen Hosp, Res Inst, Sect Pediat Emergency Med, Calgary, AB, Canada
[5] Alberta Childrens Prov Gen Hosp, Res Inst, Sect Gastroenterol, Calgary, AB, Canada
[6] Childrens Hosp Philadelphia, Div Emergency Med, Philadelphia, PA 19104 USA
[7] Univ Colorado Hosp, Childrens Hosp Colorado, Pediat Emergency Med Dept, Aurora, CO USA
[8] Childrens Hosp Michigan, Div Pediat Emergency Med, Detroit, MI 48201 USA
[9] Yale Sch Med, Dept Pediat, New Haven, CT USA
[10] Yale Sch Med, Dept Emergency Med, New Haven, CT USA
[11] Cincinnati Childrens Hosp Med Ctr, Div Hosp Med, Cincinnati, OH 45229 USA
[12] Univ Alabama Birmingham, Div Pediat Emergency Med, Birmingham, AL USA