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John Ioannidis is one of the world's most important experts on the credibility of medical research. He and his team of researchers have repeatedly shown that many of the conclusions biomedical researchers arrive at in their published studies are exaggerated or flat-out wrong.
However, these studies are what doctors use to prescribe drugs or recommend surgery. Ioannidis asserts that as much as 90 percent of the published medical information relied on by doctors is flawed or incorrect.