?:authorAffiliation
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[\'Department of Neurology, Akershus University Hospital, PO Box 1000, 1478, Lørenskog, Norway. e.s.kristoffersen@medisin.uio.no.\', \'Department of General Practice, University of Oslo, Oslo, Norway. e.s.kristoffersen@medisin.uio.no.\', \'Department of Neurology, Akershus University Hospital, PO Box 1000, 1478, Lørenskog, Norway.\', \'Department of Neurology, Oslo University Hospital, Oslo, Norway.\', \'The Norwegian Air Ambulance Foundation, Oslo, Norway.\', \'Department of Neurology, Haukeland University Hospital, Bergen, Norway.\', \'National Headache Knowledge Center, Rigshospitalet, Copenhagen, Denmark.\', \'Department of Research, Innovation and Education, Division of Clinical Neuroscience, Oslo University Hospital, Oslo, Norway.\', \'Danish Headache Center, Glostrup - University of Copenhagen, Copenhagen, Denmark.\']
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