Headache DisordersAspirinHeadacheTension-Type HeadacheHeadache Disorders, SecondaryMigraine DisordersHyperostosis Frontalis InternaAnalgesicsComplementary TherapiesCluster HeadacheChronic DiseaseVascular HeadachesNorwayPrevalenceQuestionnairesPlatelet Aggregation InhibitorsAnti-Inflammatory Agents, Non-SteroidalMigraine without Aura