[1] Univ Colorado Anschutz Med Campus, Dept Neurosurgery, Aurora, CO USA
[2] Washington Univ St Louis, Sch Med, St Louis, MO USA
[3] Childrens Hosp Colorado, Dept Neurosurg, Aurora, CO USA
[4] Univ Colorado Anschutz Med Campus, Charles C Gates Ctr Regenerat Med & Stem Cell Bio, Aurora, CO USA
[5] Childrens Hosp Colorado, Dept Pediat, Aurora, CO USA