Abbreviations: LIMA, left internal mammary artery; LAD, left anterior descending artery; SVG, great saphenous vein; OPCAB, off-pump coronary artery bypass; D1, 1st branch of the diagonal artery; D2, 2nd branch of the diagonal artery; RPL, right posterior lateral artery; PDA, posterior descending artery; OM, obtuse marginal artery; RA, radial artery