[1] Univ Utah, Dept Pediat, Salt Lake City, UT 84112 USA
[2] Univ Utah, Dept Neurol, Salt Lake City, UT 84112 USA
[3] Primary Childrens Med Ctr, Salt Lake City, UT USA
[4] Univ Utah, Dept Radiol, Salt Lake City, UT 84112 USA
[5] Univ Utah, Dept Neurol, Salt Lake City, UT 84112 USA