There are two main kinds of scientific papers. Research articles primarily present new research, while review articles discuss and synthesise research that has already been published by other people. Review articles can range from informal discussions of the state of a field to systematic reviews, in which the authors exhaustively search the literature and use predefined criteria to decide which articles to include and how to combine their results. The Cochrane Collaboration is a charity that conducts systematic reviews of medical literature to make recommendations about the effectiveness and safety of medical interventions. They’re far from the only people who do this, but their reviews are generally highly regarded.
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