1. Department of Neuropathology University Hospital Magdeburg Magdeburg Germany
2. Department of General Neurosurgery Center for Neurosurgery Cologne University Hospital Faculty of Medicine and University Hospital University of Cologne Germany
3. Department of Neurosurgery University Hospital Münster Münster Germany
4. Department of Pathology UCSF San Francisco California USA
5. Department of Neurological Surgery UCSF San Francisco California USA