Failed Back Surgery SyndromeBack PainEpidural SpaceLaminectomyLow Back PainElectric Stimulation TherapyPulsed Radiofrequency TreatmentTissue AdhesionsLumbar VertebraeDiskectomySpinal FusionTreatment FailurePain, PostoperativeBackPostoperative ComplicationsTreatment OutcomeSpinal CordChronic DiseaseBariatric SurgeryBack InjuriesGeneral SurgeryThoracic SurgeryCardiac Surgical Procedures