2026. IMPROVED SAPHENOUS VEIN–PRESERVING ENDOVENOUS LASER ABLATION TECHNIQUE IN THE TREATMENT OF CHRONIC SUPERFICIAL VENOUS INSUFFICIENCY OF THE LOWER EXTREMITIES. Tạp chí Y học Cộng đồng. 67, English Version No 1, 2026 (thg. 6 2026). DOI:https://doi.org/10.52163/yhc.v67iE1.5283.