Randomized clinical trial of endovenous laser ablation versus steam ablation (LAST trial) for great saphenous varicose veins - Van den Bos, RR; Malskat, WS; De Maeseneer, MG; de Roos, KP; Groeneweg, DA; Kockaert, MA; Neumann, HA; Nijsten, T (Br J Surg, 2014)