1. Department of Neurology St. Olav's University Hospital Trondheim Norway
2. Department of Neuromedicine and Movement Science NTNU (University of Science and Technology) Trondheim Norway
3. Norwegian Advisory Unit on Headaches Trondheim Norway
4. Department of Neurosurgery St. Olav's University Hospital Trondheim Norway
5. Mayo Clinic Scottsdale Arizona USA
6. UCL Queen Square Institute of Neurology National Hospital for Neurology and Neurosurgery London UK
7. Department of Maxillofacial Surgery St. Olav's University Hospital Trondheim Norway