PubMed comprises more than 26 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites. The National Library of Medicine provides a detailed PubMed training tutorial.
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Many article databases, PubMed, Google Scholar, and others do not always include the full text of an article.
If the full text of the article is not available...