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DOAJ Directory of Open Access Journals
Available from 1988.
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EBSCOhost Academic Search Ultimate
Available from 01/03/1998.
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Hindawi Publishing Open Access Journals
Available from 01/01/1988 volume: 1.
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Publicly Available Content Database
Available from 01/01/2014.
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PubMed Central
Available from 2002 volume: 13.
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PubMed Central Open Access
Available from 2002 volume: 13.