Pain MeasurementPainPain ManagementPain, PostoperativeChronic PainAnalgesics, OpioidPain, IntractableBack PainAnalgesicsFacial PainPain ThresholdBrachial Plexus NeuritisOxycodoneLow Back PainMorphineTramadolAnalgesiaNeck PainAbdominal PainNeuralgiaTreatment OutcomePelvic PainPain PerceptionChronic DiseaseProspective StudiesAnesthetics, LocalSeverity of Illness IndexAcute PainPain, ReferredTime FactorsLidocaineHemorrhoidsReproducibility of ResultsReflex Sympathetic DystrophyFollow-Up Studies