Bibliography as TopicBibliography of MedicineBibliographyBibliography, NationalBibliography, DescriptiveBiography as TopicRandomized Controlled Trials as TopicDatabases, BibliographicHistoryLibraries, DentalMEDLARSNational Library of Medicine (U.S.)BioethicsAbstracting and Indexing as TopicLibrary Collection DevelopmentInformation SystemsLibraries, MedicalMEDLINEEvidence-Based MedicineTreatment OutcomeZygapophyseal JointChronic PainClinical Trials as TopicHistory, 20th CenturyInjections, EpiduralInternetPeriodicals as TopicInformation Storage and RetrievalCost-Benefit AnalysisUnited StatesMeta-Analysis as TopicInjections, Intra-ArticularComputersResearch DesignLow Back PainRisk FactorsNerve BlockGreat BritainOutcome Assessment (Health Care)Databases, FactualRisk AssessmentRiskSensitivity and SpecificityChronic DiseasePrognosisReproducibility of ResultsQuality of LifePregnancyNeoplasmsTime FactorsIncidenceAcute DiseaseAge FactorsSurvival Analysis