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UMLS® Reference Manual [Internet]. Bethesda (MD): National Library of Medicine (US); 2009 Sep-.
Bookshelf ID: NBK9678
The UMLS is updated twice each year in May (AA release) and November (AB release). For information about UMLS releases, licensing, and metadata, visit the current UMLS release Web page.
UMLS® Reference Manual [Internet].
Bethesda (MD): National Library of Medicine (US); 2009 Sep-.
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