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DOAJ Directory of Open Access Journals
Available from 2004.
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Free E- Journals
Available from 2004 volume: 53 issue: 1.
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Publicly Available Content Database
Available from 01/01/2004.
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PubMed Central
Available from 2018 volume: 67.
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PubMed Central Open Access
Available from 2018 volume: 67.
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Walter De Gruyter: Open Access Journals
Available from 30/06/2022 volume: 71 issue: 1.