1. Danish Headache Center, Department of Neurology, Rigshospitalet Glostrup, Denmark
2. Department of Radiology, Rigshospitalet Glostrup, Denmark
3. Department of Neurosurgery, Rigshospitalet Blegdamsvej, Denmark
4. Danish Multiple Sclerosis Center, Department of Neurology, Rigshospitalet Glostrup, Denmark
5. Department of Clinical Medicine, Faculty of Health and Medical Science, University of Copenhagen, Denmark