Breakthrough PainPainAdministration, BuccalAnalgesics, OpioidPain ManagementFentanylPain MeasurementAnalgesicsLabor PainChronic PainNarcoticsPain, PostoperativePain, IntractablePain ClinicsAnalgesia, EpiduralChronic DiseasePain ThresholdNeuralgiaPalliative CareDouble-Blind MethodPrescription Drug MisuseNeoplasmsLow Back PainTreatment OutcomeMorphineNalorphineAnalgesiaQuestionnairesArthralgiaBack PainDrug and Narcotic ControlOpioid-Related DisordersAbdominal PainAnti-Inflammatory Agents, Non-SteroidalProspective StudiesNeck PainMedication ErrorsMedication AdherencePatient SatisfactionPelvic PainAnalgesics, Non-NarcoticPain PerceptionLevorphanolFacial PainNerve BlockAcute PainRetrospective StudiesMeperidinePain, ReferredTime FactorsOccupational TherapySeverity of Illness IndexAnesthetics, LocalNarcotic AntagonistsLevallorphanFollow-Up StudiesRadionuclide GeneratorsShoulder PainPentazocineQuality of LifePhysical Therapy ModalitiesMusculoskeletal PainReceptors, Opioid, muComorbidityOpiumMedication ReconciliationMedication SystemsCohort StudiesMedication Systems, HospitalCross-Sectional StudiesAlphaprodineMorphinansLegislation, DrugCyclazocineMethadoneDextropropoxyphene