Breakthrough PainAdministration, BuccalFentanylAnalgesics, OpioidLabor PainPainAnalgesia, EpiduralPain MeasurementNasal SpraysDouble-Blind MethodNeoplasmsChronic DiseasePain, PostoperativeChronic PainPain ManagementPain ThresholdPain, IntractableRadionuclide GeneratorsLow Back PainBack PainTreatment OutcomeAbdominal PainAnesthetics, IntravenousNeck PainTime FactorsMorphineAdministration, CutaneousAerosolsPelvic PainFacial PainEpisode of CarePain PerceptionBupivacaine