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The United States National Library of Medicine (NLM), operated by the United States federal government, is the world's largest medical library. [ 5 ] Located in Bethesda, Maryland , the NLM is an institute within the National Institutes of Health .
The name "Entrez" (a greeting meaning "Come in" in French) was chosen to reflect the spirit of welcoming the public to search the content available from the NLM. Entrez Global Query is an integrated search and retrieval system that provides access to all databases simultaneously with a single query string and user interface.
Search the NLM Catalog using jsubsetim[All Fields] to find all Index Medicus journals (5021 as of 29 May 2020); or go directly to the search results for all Index Medicus journals. Search the NLM Catalog using currentlyindexed[All] to find all journals indexed in MEDLINE (5266 as of 29 May 2020); or go directly to the search results for all ...
PubMed is a free database including primarily the MEDLINE database of references and abstracts on life sciences and biomedical topics. The United States National Library of Medicine (NLM) at the National Institutes of Health maintains the database as part of the Entrez system of information retrieval.
When we search for a MeSH term, the most specific MeSH terms are automatically included in the search. This is known as the extended search or explode of that MeSH term. This additional information and the hierarchical structure (see below) make the MeSH essentially a thesaurus , rather than a plain subject headings list.
MEDLINE (Medical Literature Analysis and Retrieval System Online, or MEDLARS Online) is a bibliographic database of life sciences and biomedical information. It includes bibliographic information for articles from academic journals covering medicine, nursing, pharmacy, dentistry, veterinary medicine, and health care.
Databases and search engines differ substantially in terms of coverage and retrieval qualities. [1] Users need to account for qualities and limitations of databases and search engines, especially those searching systematically for records such as in systematic reviews or meta-analyses. [ 2 ]
The National Library of Medicine (NLM) classification system is a library indexing system covering the fields of medicine and preclinical basic sciences. The NLM classification is patterned after the Library of Congress (LC) Classification system : alphabetical letters denote broad subject categories which are subdivided by numbers. [ 1 ]