PainComplex Regional Pain SyndromesReflex Sympathetic DystrophyChronic PainPain MeasurementPain, IntractablePain ManagementPain ThresholdPain, PostoperativeLow Back PainBack PainAbdominal PainNeck PainPelvic PainPain PerceptionFacial PainAcute PainForearm InjuriesPain, ReferredAdjuvants, PharmaceuticAnalgesicsHyperalgesiaAutonomic Nerve BlockNeuralgiaSympathetic Fibers, PostganglionicShoulder PainMusculoskeletal PainBlisterNociceptorsChronic DiseaseNociceptive PainCold TemperatureKetamineTreatment OutcomeAnalgesics, OpioidMyofascial Pain SyndromesVisceral PainHandArthralgiaProspective StudiesAnalgesiaLabor PainSeverity of Illness IndexInflammationSkin