IMPROVED SAPHENOUS VEIN–PRESERVING ENDOVENOUS LASER ABLATION TECHNIQUE IN THE TREATMENT OF CHRONIC SUPERFICIAL VENOUS INSUFFICIENCY OF THE LOWER EXTREMITIES. YHCĐ [Internet]. 2026 June 2 [cited 2026 Sept. 8];67(English Version No 1, 2026). Available from: https://tapchiyhcd.vn/index.php/yhcd/article/view/5283