Varicose VeinsSaphenous VeinVeinsSclerotherapyVenous InsufficiencyFemoral VeinUltrasonography, Doppler, DuplexSclerosing SolutionsPopliteal VeinVascular Surgical ProceduresLaser TherapyStockings, CompressionPortal VeinSodium Tetradecyl SulfateCompression BandagesVaricose UlcerPulmonary VeinsJugular VeinsUltrasonography, Doppler, ColorVenous ValvesVenous PressurePhotoplethysmographyLegKlippel-Trenaunay-Weber SyndromeGroinLigationTourniquetsPhlebographyTransilluminationRecurrencePlethysmographyMesenteric VeinsRenal VeinsUmbilical VeinsIliac VeinThrombophlebitisTreatment OutcomeAngioplasty, LaserLower ExtremityBandagesAmbulatory Surgical ProceduresHemorrhoidsVenous ThrombosisHepatic VeinsContusionsProspective StudiesClothingTime FactorsPeroneal NeuropathiesSubclavian VeinTelangiectasisCatheter AblationSplenic VeinCerebral Veins