I read that deaths from coronary artery disease are down by 50 percent since 20 years ago.  How can you explain this?
D003324:Coronary Artery Disease / Q000188:drug therapy / Q000453:epidemiology / Q000401:mortality*; D006801:Humans; D009026:Mortality / Q000639:trends; D012307:Risk Factors; D014481:United States / Q000453:epidemiology