K B Alstadhaug1,2, H K Ofte3, E S Kristoffersen4,5. 1. Department of Neurology, Nordland Hospital Trust, Bodø, Norwegen. karl.bjornar.alstadhaug@nlsh.no. 2. Institute of Clinical Medicine, The Arctic University of Tromsø, 9037, Tromsø, Norwegen. karl.bjornar.alstadhaug@nlsh.no. 3. Department of Neurology, Nordland Hospital Trust, Bodø, Norwegen. 4. Department of General Practice, Institute of Health and Society University of Oslo, Oslo, Norwegen. 5. Department of Neurology, Akershus University Hospital, Lørenskog, Norwegen.
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