A comparison of internal mammary artery and saphenous vein grafts after coronary artery bypass surgery: no difference in one year occlusion rates and clinical outcome - van der Meer, J; Hillege, HL; van Gilst, WH; Brutel de la Rivière, A; Dunselman, PHJM; Fidler, V; Kootstra, GJ; Mulder, BJM; Pfisterer, M; Lie, KI (Circulation, 1994)