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DOAJ Directory of Open Access Journals
Available from 2002.
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Elsevier ScienceDirect Journals Complete
Available from 2002 volume: 10 issue: 1 until 2017 volume: 25 issue: 4.
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PubMed Central
Available from 2017 volume: 25.
Full text available at:
PubMed Central Open Access
Available from 2017 volume: 25.