It is always necessary to check whether a systematic review on your research topic has already been published to avoid unnecessary duplicated effort. You may use the following library databases to search for systematic reviews that are published or in preparation:
Note that: This is not an exhaustive list.
Tips for searching existing Systematic Reviews (you can apply them to many library databases)
► The first way is to apply search filters to limit the search results to systematic review in library databases.
1. On the search page or the search results page, look for the filters or limits on “Publication Type”, “Methodology”, “Content Type”, or “Article Type”
2. Select publication types, such as systematic reviews, meta-analysis, and meta-synthesis.
► Another way is to include systematic review as a search term to search with your keyword(s) with Boolean operator AND.
For example, sepsis AND (“systematic review” OR "research synthesis" OR "synthesis of research" OR "meta analysis" OR "meta-analysis")
Note that: If you find an existing review looks similar to yours, consider the following points to see if it is worth to continue doing your own review.
Don’t forget to search the systematic review in progress (SR protocol) which is similar to your topic. Here are a few systematic protocol registries to start from: