1. Institute of Diagnostic and Interventional Neuroradiology, University Medical Center Göttingen, Göttingen, Germany
2. Department of Neurology, University Medical Center Göttingen, Göttingen, Germany
3. Institute of Radiology und Neuroradiology, Paracelsus Medical University, Nuremberg, Germany
4. Department of Radiology and Neuroradiology, Klinikum Duisburg-Sana Kliniken, Duisburg, Germany
5. Department of Diagnostic and Interventional Neuroradiology, Medical School Hannover, Hannover, Germany
6. Department of Radiology, Helios Klinikum Meiningen, Meiningen, Germany
7. Cerebovascular Center, Stony Brook University, Stony Brook, NY, USA
8. Institute of Diagnostic and Interventional Neuroradiology, Helios Klinikum Erfurt, Erfurt, Germany