The Cochrane Library consists of a collection of evidence-based medicine databases, including the Cochrane Database of Systematic Reviews. It provides up-to-date information on the effects of interventions in health care and evidence to support decisions taken in health care and to inform those receiving care. Search for systematic reviews, protocols, trials, methods studies, and more with one click.
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A systematic review is a review of a clearly formulated question that uses systematic and explicit methods to identify, select, and critically appraise relevant research, and to collect and analyze data from the studies that are included in the review. (Definition from the Cochrane Collaboration.)