Before revision: Ioannidis has added to this work by contributing to a meta-epidemiological study which found that only 1 in 20 interventions tested in Cochrane Reviews have benefits that are supported by high-quality evidence.. He also contributed to research suggesting that the quality of this evidence does not seem to improve over time.
After revision: Ioannidis has added to this work by contributing to a meta-epidemiological study which found that only 1 in 20 interventions tested in Cochrane Reviews have benefits that are supported by high-quality URL He also contributed to research suggesting that the quality of this evidence does not seem to improve over