Effect of dipyridamole and aspirin on late vein graft patency after coronary bypass operations - Chesebro, J H; Fuster, V; Elveback, L D; Elveback, L R; Clements, I P; Smith, H C; Holmes, D R; Bardsley, W T; Pluth, J R; Wallace, R B; Puga, J F; Orszulak, T A; Piehler, J M; Danielson, G K; Schaff, H V; Frye, R L (N Engl J Med, 1984)