[1] Univ Pittsburgh Med Ctr, Dept Neurosurg, Pittsburgh, PA USA
[2] Univ Pittsburgh Med Ctr, Childrens Hosp Pittsburgh, Div Crit Care Med, Pittsburgh, PA USA
[3] Univ Pittsburgh Med Ctr, Childrens Hosp Pittsburgh, Benedum Trauma Program, Pittsburgh, PA USA
[4] Univ Pittsburgh Med Ctr, Childrens Hosp Pittsburgh, Dept Neurosurg, Pittsburgh, PA USA
[5] UPMC Childrens Hosp Pittsburgh, Pittsburgh, PA 15227 USA