16 November 2018 - This study investigated which databases and which combinations of databases should be used to identify economic evaluations to inform systematic reviews. 

It also investigated the characteristics of studies not identified in database searches and evaluated the success of MEDLINE search strategies used within typical reviews in retrieving economic evaluations (EEs) in MEDLINE.

Searching beyond key databases for published EEs may be inefficient, providing the search strategies in those key databases are adequately sensitive. Additional search approaches should be used to identify unpublished evidence (grey literature).

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