[1] Univ Pittsburgh, Dept Pediat, Sch Med, Pittsburgh, PA 15260 USA
[2] Univ Pittsburgh, Sch Med, Dept Emergency Med, Pittsburgh, PA 15260 USA
[3] Univ Pittsburgh, Sch Med, Dept Radiol, Pittsburgh, PA 15260 USA
[4] Harvard Med Sch, Boston Childrens Hosp, Div Emergency Med, Boston, MA USA
[5] Harbor UCLA Med Ctr, Dept Emergency Med, Torrance, CA USA
[6] Univ Louisville, Norton Childrens Hosp, Sch Med, Hiram C Polk Jr Dept Surg, Louisville, KY USA
[7] Case Western Univ, Cleveland Clin Childrens Hosp, Cleveland Clin Imaging Inst, Cleveland Clin Lerner Coll Med, Cleveland, OH USA
[8] Case Western Univ, Cleveland Clin Childrens Hosp, Sect Pediat Imaging, Cleveland Clin Lerner Coll Med, Cleveland, OH USA
[9] Univ Texas Austin, Dell Med Sch, Dept Pediat, Austin, TX USA
[10] US Acute Care Solut, Canton, OH USA
[11] Univ Virginia, Dept Radiol, UVA Hlth UVA Childrens, Sch Med, Charlottesville, VA USA
[12] Univ Virginia, Sch Med, Dept Pediat, UVA Hlth UVA Childrens, Charlottesville, VA USA