Trial of low dose-aspirin plusdipyridamole versus anticoagulants for prevention of aortocoronary vein graft occlusion - Pfisterer, M; Jockers, G; Regenass, S; Schmitt, HE; Skarvan, K; Hasse, J; Bur-kart, F; Meyer, B; Burckhardt, D; Miiller-Brand, J; Stulz, P; Gradel, E (Lancet, 1989)