1. Department of Neurology; University of Münster; Münster
2. Department of Diagnostic and Interventional Neuroradiology; University Medical Center Hamburg-Eppendorf; Hamburg
3. Institute of Diagnostic Radiology and Neuroradiology; University of Medicine Greifswald; Greifswald
4. Institute for Diagnostic and Interventional Neuroradiology; University Medicine Göttingen; Göttingen
5. Institute of Epidemiology and Social Medicine; University of Münster; Münster
6. Department of Clinical Radiology; University of Münster; Münster
7. Department of Neuroradiology; Asklepios Hospital Altona; Hamburg
8. Institute of Neuroradiology; University Medical Center Schleswig-Holstein; Lübeck Germany