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DOAJ Directory of Open Access Journals
Available from 2012.
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Elsevier ScienceDirect Journals Complete
Available from 2014 volume: 21 issue: 5 until 2016 volume: 23 issue: 6.
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Karger Open Access Journals
Available from 01/01/2017 volume: 24 issue: 1.
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PubMed Central
Available from 2015 volume: 22.