1. Department of Neurology Stavanger University Hospital Stavanger Norway
2. Neuroscience Research Group Stavanger University Hospital Stavanger Norway
3. Department of Neurosurgery Haukeland University Hospital Bergen Norway
4. Center for Neurovascular Diseases Haukeland University Hospital Bergen Norway
5. Department of Clinical Science University of Bergen Bergen Norway
6. Department of Neurology Haukeland University Hospital Bergen Norway