1. Department of Neurology; Stavanger University Hospital; Stavanger Norway
2. Neuroscience Research Group; Stavanger University Hospital; Stavanger Norway
3. Department of Radiology; Stavanger University Hospital; Stavanger Norway
4. Radiological Research Group; Stavanger University Hospital; Stavanger Norway
5. Department of Neurology; Molde County Hospital; Molde Norway
6. Department of Clinical Medicine; Haukeland University Hospital; Bergen Norway