The nurse is educating a middle-aged African-American man with high cholesterol. The nurse knows to diagnose the patient as at high risk for a heart attack because based on evidence, the nurse knows that middle-aged African-American men are disproportionately affected by heart disease. What is the most credible source of this evidence?
O An article in a widely distributed magazine on health
O The published opinion of a panel of cardiac surgeons
O A meta-analysis of multiple trials published in an AMA journal
O A series of case studies on middle-aged Americans