[1] Univ Cincinnati, Dept Pediat, Coll Med, Cincinnati, OH 45229 USA
[2] Cincinnati Childrens Hosp Med Ctr, Div Emergency Med, Cincinnati, OH 45229 USA
[3] Nationwide Childrens Hosp, Qual Improvement Serv, Columbus, OH USA
[4] Kaiser Permanente, Roseville, CA USA
[5] Univ Florida, Div Emergency Med, Coll Med, Gainesville, FL USA
[6] Emory Univ, Sch Med, Dept Pediat, Atlanta, GA USA
[7] Childrens Healthcare Atlanta, Div Emergency Med, Atlanta, GA USA