Brachiocephalic VeinsVeinsArteriovenous Shunt, SurgicalVenous CutdownCatheterization, PeripheralRadial ArteryWristArmVascular PatencySaphenous VeinRenal DialysisCatheters, IndwellingUpper ExtremityPortal VeinRenal InsufficiencyVaricose VeinsPreoperative CareForearmFemoral VeinPulmonary VeinsJugular VeinsTunica IntimaHyperplasiaTime FactorsMesenteric VeinsTreatment OutcomeRenal VeinsUmbilical VeinsIliac VeinHepatic VeinsPopliteal VeinSubclavian VeinSplenic VeinCerebral VeinsRetinal VeinAzygos VeinAxillary VeinRetinal Vein OcclusionVenous ThrombosisPhlebographyVenous InsufficiencyVena Cava, InferiorGraft Occlusion, VascularUltrasonography, Doppler, DuplexHuman Umbilical Vein Endothelial CellsLegThrombophlebitisVascular Surgical ProceduresEndothelium, VascularVascular Grafting