Unstable angina---a national cooperative study comparing medical and surgical therapy.
D000368:Aged; D000787:Angina Pectoris / Q000188:drug therapy / Q000401:mortality / Q000601:surgery / Q000628:therapy*; D002986:Clinical Trials as Topic; D017023:Coronary Angiography; D006801:Humans; D008722:Methods; D009203:Myocardial Infarction / Q000150:complications