Headache DisordersHeadacheHeadache Disorders, PrimaryHeadache Disorders, SecondaryTension-Type HeadacheMigraine DisordersCluster HeadacheTrigeminal Autonomic CephalalgiasHyperostosis Frontalis InternaAnalgesicsMigraine without AuraMigraine with AuraNeurologyFacial NeuralgiaComplementary TherapiesTryptaminesChronic DiseaseSUNCT SyndromeQuestionnairesVascular HeadachesNorwayPrevalenceIndomethacinBipolar DisorderMental Disorders