A hedge or filter is a standardised search strategy that is designed to be used in conjunction with a subject search to retrieve valid studies from the (primary) medical or health sciences literature.
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Filters work in one of two ways by:
Methodological search filters focus on the methods of qualitative research rather than the content. They are often combined with the search terms. They can be a:
See specific database filters for PubMed, Medline, CINAHL and PsycINFO in the adjacent box.
In CINAHL do a search for your topic and then: