Breakthrough PainAdministration, BuccalFentanylLabor PainAnalgesics, OpioidPainAnalgesia, EpiduralPain MeasurementDouble-Blind MethodNeoplasmsChronic DiseaseMedication ErrorsMedication AdherencePain ManagementChronic PainPain ThresholdPain, PostoperativeRadionuclide GeneratorsPain, IntractableLow Back PainBack PainAbdominal PainNeck PainMedication ReconciliationMedication SystemsMedication Systems, HospitalPelvic PainTreatment OutcomePain PerceptionFacial Pain