[1] Univ Zurich Hosp, Dept Neurol, CH-8091 Zurich, Switzerland
[2] Univ Hosp Dusseldorf, Inst Neuropathol, Dusseldorf, Germany
[3] Univ Zurich Hosp, Dept Neurosurg, CH-8091 Zurich, Switzerland
[4] Univ Zurich Hosp, CH-8091 Zurich, Switzerland
[5] Univ Dusseldorf, Inst Neuropathol, Dusseldorf, Germany