Bibliography as TopicBibliography of MedicineBibliographyBibliography, NationalBibliography, DescriptiveBiography as TopicRandomized Controlled Trials as TopicDatabases, BibliographicHistoryLibraries, DentalMEDLARSNational Library of Medicine (U.S.)BioethicsAbstracting and Indexing as TopicInformation SystemsLibrary Collection DevelopmentLibraries, MedicalMEDLINETreatment OutcomeEvidence-Based MedicineZygapophyseal JointClinical Trials as TopicChronic PainHistory, 20th CenturyInternetInformation Storage and RetrievalPeriodicals as TopicInjections, EpiduralUnited StatesCost-Benefit AnalysisMeta-Analysis as TopicComputersInjections, Intra-ArticularResearch DesignRisk FactorsLow Back PainGreat BritainNerve BlockDatabases, FactualOutcome Assessment (Health Care)Risk AssessmentTime FactorsRiskSensitivity and SpecificityChronic DiseaseReproducibility of ResultsPrognosisPregnancyNeoplasmsQuality of LifeIncidenceAcute DiseaseAge FactorsNatural Orifice Endoscopic SurgerySurvival Analysis