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AspirinHeadacheHeadache DisordersTension-Type HeadacheCluster HeadacheVascular HeadachesMigraine DisordersHeadache Disorders, SecondaryMedication ErrorsMedication AdherencePlatelet Aggregation InhibitorsAnti-Inflammatory Agents, Non-SteroidalMedication ReconciliationMedication SystemsMedication Systems, HospitalTreatment OutcomeMigraine without AuraSelf MedicationAnalgesicsTiclopidineDrug Therapy, CombinationPatient CompliancePrescription DrugsDrug PrescriptionsDouble-Blind MethodThromboxane B2Prospective StudiesCyclooxygenase InhibitorsRisk FactorsDrug TherapyPolypharmacyPlatelet AggregationNonprescription DrugsSpinal PunctureQuestionnairesRetrospective StudiesSalicylatesPsychotropic DrugsMigraine with AuraFollow-Up StudiesUnited StatesTime FactorsDrug UtilizationPlatelet Function TestsNeurologyChronic DiseaseAntipsychotic AgentsBlood Patch, EpiduralAntihypertensive AgentsDrug-Related Side Effects and Adverse ReactionsTryptaminesPrevalenceDose-Response Relationship, DrugCross-Sectional StudiesSumatriptanCohort StudiesDrug CostsTrigeminal Autonomic CephalalgiasBlood PlateletsPharmacistsClinical Pharmacy Information SystemsDrug Administration ScheduleComorbiditySeverity of Illness IndexAnticoagulantsRecurrencePharmaceutical PreparationsAntidepressive AgentsFibrinolytic AgentsPain MeasurementWarfarinSodium SalicylateDura MaterDrug InteractionsMedical Order Entry SystemsIbuprofenPhysician's Practice PatternsHemorrhageDrug Therapy, Computer-AssistedAcetaminophenAdministration, OralAge FactorsIntracranial HypotensionRisk AssessmentRandomized Controlled Trials as TopicTablets, Enteric-CoatedElectronic PrescribingTreatment RefusalAsthma, Aspirin-InducedPlacebosHypertensionMagnetic Resonance ImagingAnti-Asthmatic AgentsGastrointestinal HemorrhagePainLogistic ModelsTrigeminal NerveInsurance, Pharmaceutical ServicesPilot ProjectsIncidence