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What is a PMID?

And have they changed their numbering system lately?

PMID numbers are unique identifiers assigned by the National Library of Medicine; every article in their database of over 20,000,000 articles has a unique number. Usually they are 9 digits long.

Recently they have begun adding "version numbers" which indicate changes and amendments to records.

PMID's can be used in the UTLibrary's Article Finder to easily locate full text articles.

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