A comparison of internal mammary artery and saphenous vein grafts after coronary artery bypass: no difference in one year occlusion rates and clinical outcome - van der, Meer J; Hillege, H L; vanGilst, W H; Brutel de la Rivière, A; Dunselman, P HJM; Fidler, V; Koostra, G J; Mulder, B JM; Pfisterer, M; Lie, K I (Circulation, 1994)