Commentary on 1971 reflection of 1970 statistics.
D000787:Angina Pectoris / Q000601:surgery; D001026:Coronary Artery Bypass; D003327:Coronary Disease / Q000601:surgery*; D003331:Coronary Vessels / Q000601:surgery*; D006801:Humans; D012955:Societies, Medical; D013223:Statistics as Topic