To find studies for your systematic review, you will of course need to search a database. But why more than one?
First, databases contain different journals. They will not retrieve the same results, and using only one biases your review by excluding relevant material.
Second, databases search differently and as a result retrieve different articles. They also provide different search tools to use.
Within each database, use a number of search strategies. This ensures that your search retrieves the best number of results.
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