1. Department of Neurosurgery, University Medical Center Regensburg , Regensburg , Germany
2. Brain Tumor Center, University Medical Center Regensburg , Regensburg , Germany
3. Wilhelm Sander Neuro-Oncology Unit, University Medical Center Regensburg , Regensburg , Germany
4. Department of Radiotherapy, University Medical Center Regensburg , Regensburg , Germany
5. Department of Neuropathology, University Medical Center Regensburg , Regensburg , Germany