Many people consider systematic reviews to be the best source of information for making clinical and policy decisions. However, in this issue, Shojania and coworkers describe how quickly the conclusions of 100 systematic reviews went out of date because of newly completed randomized trials. Current evidence also suggests that clinicians and policymakers less frequently use systematic reviews. We urgently need a new type of review
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Laupacis et al. (2007) studied this question.
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