[1] Childrens Hosp Philadelphia, Div Gen Pediat, Philadelphia, PA 19104 USA
[2] Childrens Hosp Philadelphia, Ctr Pediat Clin Effectiveness, Philadelphia, PA 19104 USA
[3] Univ Penn, Dept Biostat & Epidemiol, Philadelphia, PA 19104 USA
[4] Univ Penn, Dept Pediat, Perelman Sch Med, Philadelphia, PA 19104 USA
[5] Brown Univ, Alpert Med Sch, Dept Emergency Med, Providence, RI 02912 USA
[6] Brown Univ, Alpert Med Sch, Injury Prevent Ctr, Providence, RI 02912 USA
[7] Hasbro Childrens Hosp, Providence, RI USA
[8] Univ Colorado, Sch Med, Dept Emergency Med, Aurora, CO USA
[9] Univ Colorado, Sch Med, Kempe Ctr Prevent & Treatment Child Abuse & Negle, Aurora, CO USA
[10] Univ Missouri, Sch Med, Dept Pediat, Div Child Abuse & Neglect, Kansas City, MO 64108 USA
[11] Childrens Mercy Hosp, Kansas City, MO 64108 USA
[12] Univ Pittsburgh, Childrens Hosp Pittsburgh, Med Ctr, Safar Ctr Resuscitat Res,Dept Pediat, Pittsburgh, PA 15213 USA
[13] Childrens Hosp Philadelphia, PolicyLab, Philadelphia, PA 19104 USA