[1] Univ Utah, Sch Med, Dept Pediat, Div Pediat Emergency Med, Salt Lake City, UT USA
[2] Univ Utah, Sch Med, Dept Pediat, Div Child Protect & Family Hlth, Salt Lake City, UT USA
[3] Univ Cincinnati, Coll Med, Cincinnati Childrens Hosp Med Ctr, Mayerson Ctr Safe & Healthy Children, Cincinnati, OH USA