PMID stands for "PubMed Identification Number," which is a number that uniquely identifies an article record included in the National Library of Medicine's PubMed database. A PMID is assigned to each article record as it is added to the PubMed database. PMIDs sometimes appear in the reference lists of peer-reviewed journal articles, especially in the health sciences.
PMIDs appear on all PubMed result pages and article detail pages. Here are examples:
In some cases, you can find articles in the library's databases by searching for the PMID of the article. For example, here's how to search by PMID using Medline w/ Full Text:
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