1 Department of Neurology, Oslo University Hospital - Rikshospitalet, PO Box 4950 Nydalen, 0424, Oslo, Norway; Faculty of Medicine, University of Oslo, PO Box 1072 Blindern, 0316, Oslo, Norway. Electronic address: albgon@ous-hf.no.
2 Neuroscience Research Group and Department of Neurology, Stavanger University Hospital, PO Box 8100, 4068, Stavanger, Norway.
3 Department of Neurosurgery, Section of Clinical Neurophysiology, Oslo University Hospital - Rikshospitalet, PO Box 4950 Nydalen, 0424, Oslo, Norway.
4 Department of Neurosurgery, Section of Clinical Neurophysiology, Oslo University Hospital - Rikshospitalet, PO Box 4950 Nydalen, 0424, Oslo, Norway; Department of Neurology, Østfold County Hospital, PO Box 300, 1714, Grålum, Norway.
5 Department of Cardiology, Oslo University Hospital - Rikshospitalet, PO Box 4950 Nydalen, 0424, Oslo, Norway; Faculty of Medicine, University of Oslo, PO Box 1072 Blindern, 0316, Oslo, Norway.
6 Faculty of Medicine, University of Oslo, PO Box 1072 Blindern, 0316, Oslo, Norway; Department of Cardiology, Oslo University Hospital - Rikshospitalet, PO Box 4950 Nydalen, 0424, Oslo, Norway.
7 Department of Neurology, Oslo University Hospital - Rikshospitalet, PO Box 4950 Nydalen, 0424, Oslo, Norway; Faculty of Medicine, University of Oslo, PO Box 1072 Blindern, 0316, Oslo, Norway.