Breakthrough PainAdministration, BuccalPalliative CareAnalgesics, OpioidFentanylPainLabor PainPain MeasurementAnalgesicsPain ManagementChronic PainAnalgesia, EpiduralPain, PostoperativePain, IntractablePrescription Drug MisuseNeoplasmsDouble-Blind MethodChronic DiseaseTreatment OutcomeArthralgiaMedication ErrorsMedication AdherenceNeuralgiaQuestionnairesProspective StudiesRetrospective StudiesTerminal CareQuality of LifeAnti-Inflammatory Agents, Non-SteroidalPain ThresholdTime FactorsPatient SatisfactionRadionuclide GeneratorsSeverity of Illness IndexLow Back PainBack PainFollow-Up StudiesTerminally IllAbdominal PainHospice CareComorbidityNeck PainMedication ReconciliationMedication SystemsCohort StudiesMedication Systems, HospitalPelvic PainPain PerceptionFacial Pain