AnalgesiaPain, PostoperativeAnalgesia, EpiduralPostoperative ComplicationsAnalgesia, ObstetricalTreatment OutcomePostoperative PeriodPainAnalgesia, Patient-ControlledFollow-Up StudiesRetrospective StudiesProspective StudiesPain MeasurementAnalgesics, OpioidPain ManagementPain ThresholdChronic PainMorphineBupivacaineAnalgesicsAnesthetics, LocalAcupuncture AnalgesiaFentanylPain, IntractableBack PainLow Back PainLabor PainPain PerceptionAbdominal PainAnesthesia, EpiduralNeck PainMeperidinePost and Core TechniqueNerve BlockAcute PainInjections, SpinalSufentanilPelvic PainFacial PainDouble-Blind MethodLabor, ObstetricPain, ReferredAnesthesia, ObstetricalOperative TimeTramadolAnalgesics, Non-NarcoticAmidesShoulder PainAnesthesia, SpinalTime FactorsNociceptive PainCesarean SectionHyperalgesiaMusculoskeletal PainLaparoscopyLidocaineNaloxoneNeuralgiaPostoperative Nausea and VomitingSurgical Procedures, OperativeAnesthesia, GeneralKetorolacInterpleural AnalgesiaDrug TolerancePregnancyHydromorphoneThoracotomyConscious SedationPostoperative CareReceptors, Opioid, muAnesthesia, LocalNociceptorsKetamineLabor Stage, FirstAnesthesia, CaudalClonidineFemoral NerveExtraction, ObstetricalAnesthesia, ConductionReceptors, OpioidHysterectomyVisceral PainHypnotics and SedativesAnesthesia and AnalgesiaChronic DiseasePirinitramideButorphanolNarcotic AntagonistsAmbulatory Surgical ProceduresAlfentanilElectroacupunctureOpioid PeptidesDentistry, OperativeNalbuphineKetoprofenPlacebo EffectAnesthetics, CombinedOxycodonePruritusInjections, Epidural