1. Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
2. Research and Communication Unit for Musculoskeletal Health, Division of Clinical Neuroscience, Oslo University Hospital, Ullevål, Oslo, Norway
3. Department of Neurology, Oslo University Hospital, Oslo, Norway
4. Norwegian Centre for Violence and Traumatic Stress Studies, Oslo, Norway
5. Department of Neuromedicine and Movement Science, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway
6. Norwegian Advisory Unit on Headache, Department of Neurology and Clinical Neurophysiology, St. Olavs University Hospital Trondheim, Norway