HeadacheAspirinHeadache DisordersTension-Type HeadacheCluster HeadacheVascular HeadachesMigraine DisordersHeadache Disorders, SecondaryMigraine without AuraPlatelet Aggregation InhibitorsAnti-Inflammatory Agents, Non-SteroidalSpinal PunctureMigraine with AuraBlood Patch, EpiduralAnalgesicsNeurologyTrigeminal Autonomic CephalalgiasTryptaminesSumatriptanDura MaterTreatment OutcomeIntracranial HypotensionTiclopidineThromboxane B2Trigeminal NerveCyclooxygenase InhibitorsPhotophobiaDouble-Blind MethodPlatelet AggregationDrug Therapy, CombinationPrevalenceSalicylatesPain MeasurementMagnetic Resonance ImagingQuestionnairesChronic DiseaseProspective StudiesPlatelet Function TestsTomography, X-Ray ComputedFacial PainNeurologic ExaminationRisk FactorsFlushingTime FactorsFacial NeuralgiaNeck PainDiagnostic Techniques, NeurologicalBlood PlateletsPseudotumor CerebriRecurrenceDose-Response Relationship, DrugAmitriptylineRetrospective StudiesFollow-Up StudiesTemporomandibular Joint DisordersRelaxation TherapyComorbidityNeurosurgical ProceduresSodium SalicylateWhiplash Injuries