1. Department of Neurosurgery, Academic Teaching Hospital Munich-Bogenhausen, Technical University of Munich, Englschalkinger Straße 77, 81925 Munich, Germany
2. Department of Neurosurgery, Charité University Hospital, Augustenburger Platz 1, 13353 Berlin, Germany
3. Department of Radiology, Academic Teaching Hospital Munich-Bogenhausen, Technical University of Munich, Englschalkinger Straße 77, 81925 Munich, Germany
4. Department of Neurosurgery, Academic Teaching Hospital Munich-Schwabing, Ludwig Maximilian University of Munich, Kölner Platz 1, 80804 Munich, Germany