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Full text available at:
DOAJ Directory of Open Access Journals
Available from 2007.
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Elsevier ScienceDirect Journals Complete
Available from 2014 volume: 50 issue: 1 until 2017 volume: 53 issue: 6.
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Publicly Available Content Database
Available from 01/01/2018.
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PubMed Central
Available from 2018 volume: 54.
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PubMed Central Open Access
Available from 2018 volume: 54.