The decreasing risk of aortocoronary bypass.
D000328:Adult; D000367:Age Factors; D000368:Aged; D000787:Angina Pectoris / Q000601:surgery; D001026:Coronary Artery Bypass / Q000009:adverse effects* / Q000401:mortality; D006801:Humans; D008875:Middle Aged; D012501:Saphenous Vein / Q000637:transplantation; D013714:Tennessee; D014182:Transplantation, Autologous