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Pub Med automatically links to Me SH terms and subheadings.Examples would be: "bad breath" links to (and includes in the search) "halitosis", "heart attack" to "myocardial infarction", "breast cancer" to "breast neoplasms".A reference which is judged particularly relevant can be marked and "related articles" can be identified.
Pub Med Central (PMC) is a free resource that provides access to millions of peer-reviewed articles in the biomedical and life sciences field, mainly from the MEDLINE database.
The archive is maintained by the US National Library of Medicine at the National Institutes of Health (NIH) and allows authors and publishers to store and cross-reference information from several sources using a common format within a single platform.
NIH-funded articles should be submitted to PMC immediately after being accepted by a journal; the manuscripts are made publicly available within 12 months of publication.
The submission process is quite easy and fast: For methods A and B: Many journals have agreements to deposit articles in PMC, some of them with full participation, others offering selective deposit, and others with an NIH portfolio agreement, which means that they only deposit NIH-funded articles.
The search using the thesaurus Me SH is more accurate and will give us less irrelevant results.
In addition, it saves the disadvantage of the free text search in which the spelling, singular/plural or abbreviated differences have to be taken into consideration.
The related articles are then listed in order of "relatedness".
To create these lists of related articles, Pub Med compares words from the title and abstract of each citation, as well as the Me SH headings assigned, using a powerful word-weighted algorithm.
Publication type parameter allows searching by the type of publication, including reports of various kinds of clinical research.
Since July 2005, the MEDLINE article indexing process extracts identifiers from the article abstract and puts those in a field called Secondary Identifier (SI).