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BioMed Central Journals Complete
Available from 01/12/2000 volume: 1 issue: 1.
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DOAJ Directory of Open Access Journals
Available from 2000.
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GFMER Free Medical Journals
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PubMed Central
Available from 2000 volume: 1 until 2021 volume: 22.
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ROAD: Directory of Open Access Scholarly Resources
Available from 2000.