Breakthrough PainAdministration, BuccalFentanylAnalgesics, OpioidLabor PainPainDose-Response Relationship, DrugDrug Administration ScheduleAnalgesia, EpiduralPain MeasurementTreatment OutcomeErythropoietinNasal SpraysDouble-Blind MethodProspective StudiesNeoplasmsChronic DiseasePain, PostoperativeChronic PainPain ManagementPain ThresholdPain, IntractableTime FactorsRadionuclide GeneratorsLow Back PainBack PainAnesthetics, IntravenousPeptide Chain Initiation, TranslationalAbdominal PainNeck PainMorphineAerosolsAdministration, CutaneousEpisode of CareFacial PainPelvic PainPain PerceptionBupivacaineAnesthetics, LocalAdministration, OralSufentanil