1. Department of Clinical Physiology and Nuclear Medicine; Frederiksberg and Bispebjerg Hospital; University of Copenhagen; Frederiksberg Denmark
2. Danish Headache Center; Department of Neurology; Glostrup Hospital; University of Copenhagen; Glostrup Denmark
3. Department of Clinical Physiology; Glostrup Hospital; University of Copenhagen; Glostrup Denmark
4. Danish Center for Sleep Medicine; Department of Neurophysiology; Glostrup Hospital; University of Copenhagen; Glostrup Denmark