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DOAJ Directory of Open Access Journals
Available from 2008.
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EBSCOhost Academic Search Ultimate
Available from 01/04/2000.
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Publicly Available Content Database
Available from 01/03/2011.
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PubMed Central
Available from 2009 volume: 114.
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PubMed Central Open Access
Available from 2009 volume: 114.
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Taylor & Francis Open Access
Available from 1972 volume: 77 issue: 1.