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Figure 4 Plot of time-related graft patency (or freedom from graft occlusion) for saphenous vein grafts (SVG) to recipient vessel with diameters >2.0 mm versus 2.0 mm. The number of patients at each time point is listed in the figure. *p < 0.001 (>2.0 mm vs. 2.0 mm). CABG = coronary artery bypass grafting.