Venial and mortal sins: the problems of confounding and bias.
Mangano
Christina Mora
CM
D015982:Bias; D002315:Cardiopulmonary Bypass / Q000009:adverse effects*; D015986:Confounding Factors, Epidemiologic; D001026:Coronary Artery Bypass / Q000009:adverse effects / Q000379:methods; D015340:Epidemiologic Research Design; D006801:Humans