Beating hearts.
Asa
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D000368:Aged; D001026:Coronary Artery Bypass / Q000191:economics / Q000379:methods / Q000639:trends*; D004209:Disposable Equipment; D006801:Humans; D008297:Male; D008421:Materials Management, Hospital / Q000639:trends*; D019060:Minimally Invasive Surgical Procedures / Q000191:economics / Q000706:statistics & numerical data*; D013525:Surgical Instruments; D014481:United States