PolyneuropathiesPeripheral Nervous System DiseasesDiagnostic Techniques, NeurologicalPolyradiculoneuropathyAlcoholic NeuropathyElectrodiagnosisGuillain-Barre SyndromeDiabetic NeuropathiesNeural ConductionDemyelinating DiseasesPostoperative ComplicationsImmunoglobulin MIntraoperative ComplicationsTreatment OutcomeRetrospective StudiesDiabetes ComplicationsFollow-Up StudiesPregnancy ComplicationsTime FactorsProspective StudiesRisk Factors