1. Department of Neurosurgery, Vienna Medical University/AKH Wien, Vienna, Austria
2. Department of Neurosurgery, Medical University Vienna, Vienna, Austria
3. Department of Neurology, University of Erlangen-Nuernberg: Friedrich-Alexander-Universitat Erlangen-Nurnberg, Nuremberg, Germany
4. Department of Neurosurgery, Institute of Neuropathology, University Hospital Erlangen Nuremberg, Nuremberg, Germany