Comparison of 1% and 3% Polidocanol foam in ultrasound guided sclerotherapy of the great saphenous vein: a ranodmised, double-blind trail with 2-year-follow-up: “The 3/1 Study” - Hamel-Desnos, C; Ouvry, P; Benigni, JP (Eur J Vasc Endovasc Surg, 2007)
et al.