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PainChronic PainAnalgesics, OpioidPain, IntractableChronic DiseaseNeoplasmsPain ClinicsPain MeasurementPain ManagementOpioid-Related DisordersCarisoprodolCatastrophizationAnalgesicsDrug IncompatibilityHydrocodoneSubstance Abuse DetectionOxycodoneFibromyalgiaLow Back PainPain ThresholdBack PainUrinalysisFacial PainQuestionnairesDrug MonitoringNeck PainPain, PostoperativeAcute PainMusculoskeletal PainNeuralgiaPain, ReferredDisability EvaluationPain PerceptionHyperalgesiaPelvic PainHydromorphoneAbdominal PainAdaptation, PsychologicalDepressionMorphineChest PainPalliative CareBone NeoplasmsShoulder PainInjections, SpinalTreatment OutcomeNeuromaFentanylProspective StudiesNociceptorsQuality of LifeTemporomandibular Joint DisordersEarly Detection of CancerNociceptive PainReproducibility of ResultsRetrospective StudiesFollow-Up StudiesAnalgesiaSeverity of Illness IndexTime FactorsSpinal CordComplex Regional Pain SyndromesAnalgesics, Non-NarcoticDisease Models, AnimalMyofascial Pain SyndromesArthralgiaUnited StatesPredictive Value of TestsCross-Sectional StudiesDouble-Blind MethodBreast NeoplasmsOxymorphoneAdministration, CutaneousAnxietyIntervertebral Disc DisplacementProstatic NeoplasmsRisk FactorsRisk AssessmentPosterior Horn CellsAnalysis of VarianceBreakthrough PainMethadoneHyperostosisPrevalencePrognosisOvarian NeoplasmsCeliac PlexusAcupuncture AnalgesiaPhysical StimulationActivities of Daily LivingSensitivity and SpecificityTramadolNeoplasm MetastasisLung NeoplasmsSensory Receptor CellsDose-Response Relationship, DrugManipulation, SpinalStomach NeoplasmsVisceral PainPsychometrics