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DOAJ Directory of Open Access Journals
Available from 1999.
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EBSCOhost Academic Search Complete
Available from 01/02/2007.
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Gale Academic OneFile
Available from 01/01/2004 until 31/01/2021.
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PubMed Central
Available from 2008 volume: 18.
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PubMed Central Open Access
Available from 2008 volume: 18.