a communitywide study was conducted in all 16 acute general hospitals in the metropolitan worcester , mass , area during the calendar years 1975 , 1978 , and 1981 to examine time trends in the attack and case-fatality rates of patients hospitalized with validated acute myocardial infarction as well as of the occurrence of out-of-hospital coronary heart disease ( chd ) deaths .
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of the
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heart