Bibliography as TopicBibliography of MedicineBibliographyBibliography, NationalBibliography, DescriptiveBiography as TopicRandomized Controlled Trials as TopicDatabases, BibliographicHistoryAbstracting and Indexing as TopicLibraries, DentalMEDLARSNational Library of Medicine (U.S.)BioethicsMEDLINEInformation SystemsEvidence-Based MedicineLibrary Collection DevelopmentLibraries, MedicalPeriodicals as TopicClinical Trials as TopicTreatment OutcomeZygapophyseal JointChronic PainHistory, 20th CenturyInternetMeta-Analysis as TopicInformation Storage and RetrievalUnited StatesInjections, EpiduralCost-Benefit AnalysisResearch DesignComputersInjections, Intra-ArticularRisk FactorsLow Back PainGreat BritainNerve BlockOutcome Assessment (Health Care)Databases, FactualRisk AssessmentRiskChronic DiseaseCongresses as TopicSensitivity and SpecificityNeoplasmsTime FactorsReproducibility of ResultsPrognosisPregnancyQuality of LifeTextbooks as TopicIncidenceAge FactorsAcute DiseaseReview Literature as TopicSurvival Analysis