[1] Childrens Hosp, Dept Oncol, Denver, CO 80218 USA
[2] Univ Colorado, Hlth Sci Ctr, Neurooncol Program, Denver, CO USA
[3] Univ Colorado, Sch Med, Boulder, CO 80309 USA
[4] Childrens Hosp, Dept Intens Care Med, Denver, CO 80218 USA
[5] Univ Colorado, Hlth Sci Ctr, Dept Neurosurg, Denver, CO USA
[6] Univ Colorado, Hlth Sci Ctr, Dept Oncol, Denver, CO USA