Breakthrough PainAdministration, BuccalAnalgesics, OpioidFentanylPainLabor PainPain MeasurementAnalgesicsPain ManagementChronic PainAnalgesia, EpiduralPain, PostoperativePain, IntractablePrescription Drug MisuseDouble-Blind MethodNeoplasmsChronic DiseaseArthralgiaTreatment OutcomeMedication ErrorsMedication AdherenceNeuralgiaNarcoticsPalliative CareOpiate AlkaloidsQuestionnairesOpioid-Related DisordersProspective StudiesPain ThresholdMorphineAnti-Inflammatory Agents, Non-SteroidalTime FactorsRetrospective StudiesRadionuclide GeneratorsLow Back PainBack PainNaloxoneSeverity of Illness IndexReceptors, OpioidQuality of LifePatient SatisfactionFollow-Up StudiesAbdominal PainNeck PainComorbidityMedication ReconciliationMedication SystemsMedication Systems, HospitalCohort StudiesPelvic PainPain PerceptionCodeineNarcotic AntagonistsFacial Pain