Hubungan Diameter dan Angka Oklusi Vena Saphena Magna Terhadap Revised Venous Clinical Severity Score (r-VCSS) Pasca Tindakan Endovenous Laser Ablation (EVLA) pada Pasien Insufisiensi Vena Kronik = Correlation between Diameter and Occlusion Rate of Great Saphenous Vein on Revised venous Clinical Severity Score (r-VCSS) After Endovenous Laser Ablation (EVLA) in Chronic Venous Insufficiency Patient