Breakthrough PainAdministration, BuccalFentanylAnalgesics, OpioidPainLabor PainPain MeasurementMethyl ParathionAnalgesicsPain ManagementCholinesterasesChronic PainAnalgesia, EpiduralDose-Response Relationship, DrugPain, PostoperativeDrugs, Chinese HerbalPain, IntractablePrescription Drug MisuseDouble-Blind MethodTime FactorsNeoplasmsChronic DiseaseDrug Therapy, CombinationArthralgiaTreatment OutcomeMedication ErrorsMedication AdherenceRats, Sprague-DawleyNeuralgiaPalliative CareQuestionnairesProspective StudiesAnti-Inflammatory Agents, Non-SteroidalPain ThresholdRetrospective StudiesRadionuclide GeneratorsLow Back PainBack PainSeverity of Illness IndexQuality of LifePatient SatisfactionFollow-Up StudiesAbdominal PainNeck PainMedication SystemsComorbidityMedication ReconciliationMedication Systems, HospitalCohort StudiesPelvic PainPain PerceptionGene DosageFacial Pain