1. Danish Headache Center, Department of Neurology, Rigshospitalet Glostrup, Faculty of Health and Medical Sciences, University of Copenhagen, Glostrup, Denmark
2. Department of Dermatology and Allergy, Herlev and Gentofte Hospital, University of Copenhagen, Hellerup, Denmark
3. Copenhagen Research Group for Inflammatory Skin (CORGIS), Hellerup, Denmark
4. Department of Clinical Biochemistry, Bispebjerg Frederiksberg Hospital, University of Copenhagen, Bispebjerg, Denmark