1. Department of Neuropathology; Regensburg University Hospital; Regensburg Germany
2. Department of Neurosurgery and; Regensburg University Hospital; Regensburg Germany
3. Wilhelm Sander-NeuroOncology Unit; Regensburg University Hospital; Regensburg Germany
4. Institute of Biochemistry, Emil-FischerCenter, Friedrich-Alexander-University Erlangen-Nuernberg; Erlangen Germany