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You will need to search biomedical databases for appropriate literature. Databases are required because:
the content is peer-reviewed
includes reputable journals
excludes commercial and biased sources
allows a systematic search methodology which can be replicated in final report
they allow advanced search techniques
support reference management
Major biomedical databases include Medline, PubMed, Embase and PsycInfo. More information here.
Depending on your topic these databases may be enough. However you may also need to search:
grey literature - government and organisational publications, research reports, white papers etc.
subject specific databases
citation databases - these allow you to follow citations to and from relevant papers. Citation databases include Scopus and Web of Science. these are not available from the Health Sciences Library but are available through UoM.
the internet generally
Before starting to search, make sure you have a clear statement of your question. This allows you to target your search to the most relevant material.