Spinal Cord StimulationElectric Stimulation TherapySpinal CordChronic PainFailed Back Surgery SyndromeParesthesiaPain, IntractableSpinal Cord InjuriesElectrodes, ImplantedPain ManagementEpidural SpacePainIntercostal MusclesNeuralgiaImplantable NeurostimulatorsElectric StimulationReflex Sympathetic DystrophyPain MeasurementTranscutaneous Electric Nerve StimulationComplex Regional Pain SyndromesBlood Gas Monitoring, TranscutaneousCervical VertebraeAngina PectorisChronic DiseasePulsed Radiofrequency TreatmentThoracic VertebraeBack PainQuipazineDecerebrate StateTreatment OutcomeSpinal Cord DiseasesEvoked Potentials, SomatosensoryElectrodesRespiratory MusclesIschemiaSpinal Cord CompressionLegSpinal Cord NeoplasmsPain ThresholdLocomotionInjections, SpinalPostureTime FactorsSpinal Cord IschemiaSpinal NervesDogsHyperalgesiaSpinal Nerve RootsPain PerceptionAnalgesicsPain, PostoperativeRegional Blood FlowSympathetic Nervous SystemParaplegiaAnalgesics, OpioidLow Back PainRats, Sprague-DawleyAcute PainFollow-Up StudiesMotor NeuronsPhysical StimulationNeck PainPosterior Horn CellsProspective StudiesMyocardial IschemiaNociceptorsSpinal Cord RegenerationPain ClinicsCost-Benefit AnalysisAbdominal PainRetrospective StudiesFacial PainGanglia, SpinalSpinal CanalLumbosacral RegionSpinal NeoplasmsQuadriplegiaAnesthesia, SpinalSpinal DiseasesPelvic PainMusculoskeletal PainRecovery of FunctionNeurons