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PainChronic PainPain ManagementPain ThresholdPain, PostoperativeBack PainLow Back PainPain MeasurementAbdominal PainNeck PainPain, IntractablePelvic PainPain PerceptionTime FactorsFacial PainAcute PainPain, ReferredShoulder PainMusculoskeletal PainAnalgesicsTreatment OutcomeNociceptive PainNeuralgiaChronic DiseaseModels, BiologicalPhylogenyMolecular Sequence DataAnalgesics, OpioidFollow-Up StudiesModels, TheoreticalComputer SimulationHyperalgesiaMyofascial Pain SyndromesEvolution, MolecularComplex Regional Pain SyndromesVisceral PainQuestionnairesBase SequenceArthralgiaAnalgesiaTemperatureProspective StudiesLabor PainRetrospective StudiesBiological EvolutionAlgorithmsDose-Response Relationship, DrugHistory, 20th CenturyKineticsMagnetic Resonance ImagingNociceptorsModels, ChemicalNeuronsRisk FactorsModels, StatisticalWaterReproducibility of ResultsAmino Acid SequenceModels, GeneticAnesthetics, LocalFibromyalgiaGenetic VariationBrainDisability EvaluationMutationNeoplasmsRats, WistarCatastrophizationSpecies SpecificityDisease Models, AnimalSignal TransductionEcosystemFlank PainCells, CulturedPrevalenceSequence Analysis, DNAEye PainMathematicsCohort StudiesAge FactorsDNAModels, NeurologicalDiffusionDouble-Blind MethodBiophysicsAdaptation, PhysiologicalPrognosisLong QT SyndromeMorphineMolecular Dynamics SimulationSeverity of Illness IndexSex FactorsPolymerase Chain ReactionAnalgesics, Non-NarcoticPostoperative ComplicationsModels, MolecularJapanCell LineCluster AnalysisInjections, Spinal