[1] German Canc Consortium, Dusseldorf, Germany
[2] German Canc Res Ctr Partner Site Essen Dusseldor, Div Paediat Neurooncogen, Dusseldorf, Germany
[3] Heinrich Heine Univ Dusseldorf, Dept Neurosurg, Dusseldorf, Germany
[4] Heinrich Heine Univ Dusseldorf, Dept Paediat Oncol Haematol & Clin Immunol, Dusseldorf, Germany
[5] Heinrich Heine Univ Dusseldorf, Inst Neuropathol, Dusseldorf, Germany