[1] Univ Washington, Dept Pediat, Seattle, WA 98195 USA
[2] Univ Washington, Dept Neurosurg, Seattle, WA 98195 USA
[3] Univ Washington, Dept Radiol, Seattle, WA 98195 USA
[4] Seattle Childrens Hosp, Div Pediat Neurol, Seattle, WA USA
[5] Seattle Childrens Hosp, Div Pediat Neurosurg, Seattle, WA USA
[6] Univ Washington, Dept Neurol, Seattle, WA 98195 USA