1. Department of Neurology Copenhagen University Hospital Rigshospitalet Copenhagen
2. Department of Neurology Aarhus University Hospital Aarhus
3. Department of Neuroradiology Aarhus University Hospital Aarhus
4. Department of Neurology University of Southern Denmark Odense
5. Department of Neuroradiology University of Southern Denmark Odense
6. Department of Neuroradiology Copenhagen University Hospital Rigshospitalet Copenhagen
7. The Danish Clinical Quality Program (RKKP) National Clinical Registries Aarhus
8. Danish Center for Clinical Health Services Research Department of Clinical Medicine Aalborg University and Aalborg University Hospital Aalborg Denmark