Selective use of references?
Kalant
Norman
N
D002300:Cardiac Care Facilities / Q000706:statistics & numerical data*; D016507:Cardiology Service, Hospital / Q000706:statistics & numerical data*; D001026:Coronary Artery Bypass / Q000401:mortality* / Q000706:statistics & numerical data*; D017052:Hospital Mortality / Q000639:trends*; D006801:Humans; D015203:Reproducibility of Results; D013503:Surgery Department, Hospital / Q000706:statistics & numerical data*; D014481:United States / Q000453:epidemiology