Breakthrough PainAdministration, BuccalAnalgesics, OpioidFentanylPainLabor PainPain MeasurementAnalgesicsPain ManagementChronic PainAnalgesia, EpiduralPain, PostoperativePain, IntractablePrescription Drug MisuseDouble-Blind MethodNeoplasmsChronic DiseaseTreatment OutcomeArthralgiaMedication AdherenceMedication ErrorsNeuralgiaPalliative CareQuestionnairesProspective StudiesAnti-Inflammatory Agents, Non-SteroidalTime FactorsPain ThresholdRetrospective StudiesRadionuclide GeneratorsSeverity of Illness IndexLow Back PainBack PainFollow-Up StudiesQuality of LifePatient SatisfactionAbdominal PainNeck PainComorbidityMedication ReconciliationMedication SystemsCohort StudiesMedication Systems, HospitalPelvic PainPain PerceptionFacial Pain