1. Department of Neurology Clinical Neuroscience Center University Hospital Zurich and University of Zurich Zurich Switzerland
2. Department of Neuroradiology Clinical Neuroscience Center University Hospital Zurich and University of Zurich Zurich Switzerland
3. Department of Biostatistics Epidemiology, Biostatistics and Prevention Institute University of Zurich Zurich Switzerland
4. Department of Diagnostic and Interventional Neuroradiology University Hospital Berne and University of Berne Berne Switzerland
5. Department of Neurology University Hospital Berne and University of Berne Berne Switzerland
6. Department of Diagnostic, Interventional and Pediatric Radiology University Hospital Berne and University of Berne Berne Switzerland