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Cochrane Reviews are peer reviewed to ensure that they follow the published Cochrane Protocol (or any deviation from the published protocol is sufficiently explained); the research question is still valid, to identify whether any relevant and important studies have been excluded, the clinical context is correct and up-to-date, the methodology is appropriate and that the conclusions are based only upon the data available. Cochrane Reviews may be rejected before or after peer review; for example, if the methodology is unsound, or if the authors are unable to revise the review to the satisfaction of the Cochrane Review Group EditorReview Group's (CRG) Co-ordinating Editor(s). For more information, see the policy on the rejection of Cochrane Reviews.