1. Department of Diagnostic and Interventional Neuroradiology, Hannover Medical School Hannover, Hannover, Germany
2. Department of Neurosurgery, Hannover Medical School, Hannover, Germany
3. Department of Neurology and Clinical Neurophysiology, Hannover Medical School, Hannover, Germany
4. Department of Radiology and Neuroradiology, Sana Kliniken Duisburg, Duisburg, Germany