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One New Thing
Thursday, February 12, 2004
One New Thing: New MeSH subject headings (used in Medline) aren’t applied retrospectively.

This was mentioned in passing at an Ovid training session, and this NLM page confirms it: “Searching for a new MeSH Term qualified as [MeSH Term] or [Major MeSH Topic] effectively limits retrieval to citations indexed after the term was introduced”. So you need to find older citations using an unqualified search, such as a keyword search.

Plus I learnt about the In-Process database within Medline (where citations live until they have been fully indexed) - using PubMed to search is possibly why I never noticed it before?

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