AspirinStrokePlatelet Aggregation InhibitorsBrain IschemiaAnti-Inflammatory Agents, Non-SteroidalWarfarinAnticoagulantsAtrial FibrillationSecondary PreventionCerebrovascular Disordersbeta-AlanineRisk FactorsIschemic Attack, TransientPrimary PreventionPyridonesFibrinolytic AgentsRandomized Controlled Trials as TopicAtrial AppendageTreatment OutcomeBenzimidazolesEndarterectomy, CarotidHemorrhageCerebral HemorrhageRecurrenceCerebral InfarctionThromboembolismAustriaTiclopidineProspective StudiesFollow-Up StudiesThiophenesIncidenceTime FactorsDipyridamoleCarotid StenosisRisk AssessmentInternational Normalized RatioBenzylaminesUnited StatesAzetidinesCohort StudiesClinical Trials as TopicCost-Benefit AnalysisDrug Therapy, CombinationCarotid Artery DiseasesForamen Ovale, PatentIntracranial EmbolismHypertensionQuality-Adjusted Life YearsAnemia, Sickle CellComorbidityPyrazolesAdministration, OralAntisickling AgentsDouble-Blind MethodEmbolismVitamin KAge FactorsPractice Guidelines as TopicRetrospective StudiesMulticenter Studies as TopicRiskHydroxymethylglutaryl-CoA Reductase InhibitorsSex FactorsAntihypertensive AgentsSeptal Occluder DeviceUltrasonography, Doppler, TranscranialPatient SelectionPrevalenceRegistriesOdds RatioHeart DiseasesThromboxane B2Markov ChainsCenters for Disease Control and Prevention (U.S.)Guideline AdherenceMultivariate AnalysisMorpholinesCyclooxygenase InhibitorsEvidence-Based MedicineAcute DiseasePlatelet AggregationDose-Response Relationship, Drug