[1] Washington Univ, Sch Med, Dept Neurol, St Louis, MO 63130 USA
[2] Washington Univ, Sch Med, Dept Radiol, St Louis, MO 63130 USA
[3] Washington Univ, Sch Med, Dept Pediat, St Louis, MO 63130 USA
[4] Washington Univ, Sch Med, Dept Anat & Neurobiol, St Louis, MO 63130 USA
[5] Washington Univ, Dept Psychol, St Louis, MO 63130 USA
[6] Washington Univ, Sch Med, Dept Neurosurg, St Louis, MO 63130 USA
[7] Washington Univ, Dept Biomed Engn, St Louis, MO USA