Is the placebo powerless? Update of a systematic review with 52 new randomized trials comparing placebo with no treatment

@article{Hrbjartsson2004IsTP,
  title={Is the placebo powerless? Update of a systematic review with 52 new randomized trials comparing placebo with no treatment},
  author={A. Hr{\~o}bjartsson and P. G{\o}tzsche},
  journal={Journal of Internal Medicine},
  year={2004},
  volume={256}
}
Background.  It is widely believed that placebo interventions induce powerful effects. We could not confirm this in a systematic review of 114 randomized trials that compared placebo‐treated with untreated patients. 
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