1. Department of Neurology and Wilhelm Sander-NeuroOncology Unit, Regensburg University Hospital , Regensburg , Germany
2. Center for Quality Assurance and Health Services Research, University of Regensburg , Regensburg , Germany
3. Department of Internal Medicine III, Regensburg University Hospital , Regensburg , Germany
4. Department of Radiotherapy, Regensburg University Hospital , Regensburg , Germany
5. Department of Neurosurgery, Regensburg University Hospital , Regensburg , Germany
6. Department of Neuropathology, Regensburg University Hospital , Regensburg , Germany