Bibliography as TopicBibliography of MedicineBibliographyBibliography, NationalBibliography, DescriptiveBiography as TopicRandomized Controlled Trials as TopicDatabases, BibliographicHistoryNational Library of Medicine (U.S.)Libraries, DentalMEDLARSUnited StatesBioethicsAbstracting and Indexing as TopicInformation SystemsNational Institutes of Health (U.S.)Libraries, MedicalLibrary Collection DevelopmentMEDLINETreatment OutcomeEvidence-Based MedicineClinical Trials as TopicHistory, 20th CenturyZygapophyseal JointChronic PainRisk FactorsInternetNational Health ProgramsGreat BritainCost-Benefit AnalysisPeriodicals as TopicInformation Storage and RetrievalInjections, EpiduralResearch DesignDatabases, FactualMeta-Analysis as TopicComputersInjections, Intra-ArticularRisk AssessmentOutcome Assessment (Health Care)Low Back PainIncidenceAge FactorsNerve BlockRiskTime FactorsNational Cancer Institute (U.S.)PregnancyNeoplasmsChronic DiseaseNational Center for Health Statistics (U.S.)Reproducibility of ResultsSensitivity and SpecificityPrognosisHealth SurveysQuality of LifeNational Heart, Lung, and Blood Institute (U.S.)Acute DiseaseNutrition SurveysSurvival AnalysisData CollectionPrevalencePopulation SurveillanceNational Academy of Sciences (U.S.)RegistriesHealth Care SurveysCross-Sectional StudiesNational Institute for Occupational Safety and Health (U.S.)QuestionnairesHealth Policy