[1] Vrije Univ Amsterdam, Med Ctr, Dept Pediat Oncol, Amsterdam, Netherlands
[2] Vrije Univ Amsterdam, Med Ctr, Dept Neurosurg, Amsterdam, Netherlands
[3] Vrije Univ Amsterdam, Med Ctr, Neurooncol Res Grp, Amsterdam, Netherlands
[4] Vrije Univ Amsterdam, Med Ctr, Dept Pathol, Amsterdam, Netherlands
[5] Radboud Univ Nijmegen, Med Ctr, Dept Pathol, Nijmegen, Netherlands
[6] Acad Princess Maxima Ctr Pediat Oncol, Utrecht, Netherlands