Ricci, S. Comment To: Volume Displacements from an Incompetent Great Saphenous Vein During a Standardised Valsalva Manoeuvre, by Lattimer CR, Kalodiki E, Azzam M, Geroulakos G. Acta Phlebologica 2012;13:25-30. Veins & Lymphatics 2012, 1, 5.