[1] Univ Munich, Dept Neurosurg, Munich, Germany
[2] Univ Dusseldorf, Dept Neuropathol, Dusseldorf, Germany
[3] Univ Munich, Dept Neuropathol, Munich, Germany
[4] Univ Hamburg, Dept Neurosurg, Hamburg, Germany
[5] Univ Dresden, Dept Neurosurg, Dresden, Germany
[6] Univ Leipzig, Inst Med Informat Stat & Epidemiol, Leipzig, Germany
[7] Univ Zurich, Dept Neurol, Zurich, Switzerland