1. Danish Headache Center, Department of Neurology, Rigshospitalet Glostrup, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
2. Department of Neurology and Medical Image Analysis Center, University Hospital, University of Basel, Basel, Switzerland
3. Department of Neurology, DKD Helios Klinik Wiesbaden, Wiesbaden, Germany
4. Department of Radiology, Rigshospitalet, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
5. Functional Imaging Unit, Department of Clinical Physiology, Nuclear Medicine and PET, Rigshospitalet, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark