[1] Univ Hosp Essen, Div Clin Neurooncol, Dept Neurol, Essen, Germany
[2] Univ Bonn, Div Clin Neurooncol, Dept Neurol, Med Ctr, Bonn, Germany
[3] Univ Duisburg Essen, Univ Hosp Essen, Div Clin Neurooncol, Dept Neurol, Essen, Germany
[4] Partner Site Univ Hosp Essen, German Canc Consortium DKTK, West German Canc Ctr WTZ, DKFZ,Div Translat Neurooncol, Essen, Germany
[5] Univ Duisburg Essen, Univ Hosp Essen, Dept Neurosurg, Essen, Germany
[6] Univ Duisburg Essen, Univ Hosp Essen, Dept Neurol, Essen, Germany
[7] Univ Duisburg Essen, Univ Hosp Essen, Dept Radiotherapy, Essen, Germany