1. Department of Neurology; University of Rostock; Rostock Germany
2. Department of Neurosurgery; Ernst-Moritz-Arndt University Greifswald; Greifswald Germany
3. Institute of Diagnostic Radiology and Neuroradiology; Ernst-Moritz-Arndt University Greifswald; Greifswald Germany
4. Institute of Diagnostic and Interventional Radiology; University of Rostock; Rostock Germany