Searching for existing evidence syntheses on a topic related to your own research question can be helpful to start your evidence synthesis process. You can check you are not duplicating a review that has already been registered or recently published. Existing reviews will also provide you with examples of search strategies and databases selected.

The Cochrane Library is a collection of resources that contain high-quality, independent evidence to inform healthcare decision making
Trip is a clinical search engine designed to allow users to quickly and easily find and use high-quality research evidence to support their practice and/or care.
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