1. University Hospital Bonn/Germany; Department of Radiology; Bonn Germany
2. Philips Healthcare; Hamburg Germany
3. University Hospital Bonn/Germany; Department of Neuropathology, Center for Pathology; Bonn Germany
4. BG Krankenhaus Bergmannsheil, Bochum/Germany; Bochum Germany
5. University Hospital Bonn/Germany; Center for Pathology; Bonn Germany
6. Ev. Krankenhaus Bielefeld/Germany; Department of Neurosurgery; Bielefeld Germany
7. University Hospital Bonn/Germany; Department of Neurosurgery and Stereotaxy; Bonn Germany