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DOAJ Directory of Open Access Journals
Available from 1988 until 2020.
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EBSCOhost Academic Search Ultimate
Available from 01/08/2013 until 31/12/2020.
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PubMed Central
Available from 2012 volume: 25 until 2020 volume: 33 issue: 12.
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PubMed Central Open Access
Available from 2012 volume: 25 until 2020 volume: 33.