Bibliography as TopicBibliography of MedicineBibliographyBibliography, NationalBibliography, DescriptiveBiography as TopicRandomized Controlled Trials as TopicDatabases, BibliographicHistoryLibraries, DentalMEDLARSReference StandardsNational Library of Medicine (U.S.)BioethicsAbstracting and Indexing as TopicReference ValuesLibraries, MedicalInformation SystemsLibrary Collection DevelopmentMEDLINETreatment OutcomeEvidence-Based MedicineZygapophyseal JointClinical Trials as TopicChronic PainInternetHistory, 20th CenturyPeriodicals as TopicInformation Storage and RetrievalInjections, EpiduralUnited StatesCost-Benefit AnalysisMeta-Analysis as TopicComputersInjections, Intra-ArticularResearch DesignSensitivity and SpecificityRisk FactorsReproducibility of ResultsLow Back PainGreat BritainDatabases, FactualNerve BlockOutcome Assessment (Health Care)Risk AssessmentRiskTime FactorsPregnancyChronic DiseaseAge FactorsPrognosisNeoplasmsIncidenceQuality of LifeAcute DiseaseSurvival Analysis