1. Department of Neurosurgery, Klinikum St. Marien, D‑92224 Amberg, Germany
2. Department of Neuropathology, Regensburg University Hospital, D‑93053 Regensburg, Germany
3. Medical Sociology, Institute of Epidemiology and Preventative Medicine, University of Regensburg, D‑93053 Regensburg, Germany
4. Department of Radiology, Klinikum St. Marien, D‑92224 Amberg, Germany