1. Department of Neurosurgery, University Medical Center, Göttingen, Germany
2. Department of Hematology and Medical Oncology, University Medical Center, Göttingen, Germany
3. Department of Medical Statistics, University Medical Center, Göttingen, Germany
4. Department of Neuroradiology, University Medical Center, Göttingen, Germany
5. Institute of Neuropathology, University Medical Center, Göttingen, Germany
6. Department of Radiotherapy and Radiation Oncology, University Medical Center, Göttingen, Germany
7. Department of Internal Medicine III, Hematology and Medical Oncology, University Hospital Regensburg, Regensburg, Germany