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is NLM's database covering the fields of medicine, nursing, dentistry, the health care system, and the preclinical sciences.MEDLINE contains bibliographic citations and author abstracts from over 5400 biomedical journals published in the United States and 70 other countries and dating back to the Updated 5 times/week.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.
The secondary identifier field is to store accession numbers to various databases of molecular sequence data, gene expression or chemical compounds and clinical trial IDs.
For clinical trials, Pub Med extracts trial IDs for the two largest trial registries: Clinical (NCT identifier) and the International Standard Randomized Controlled Trial Number Register (IRCTN identifier).
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.
If relevant, several studies can be selected and related articles to all of them can be generated (on Pub Med or any of the other NCBI Entrez databases) using the 'Find related data' option.
MEDLINE and Pub Med policies for the selection of journals for database inclusion are slightly different.
Weaknesses in the criteria and procedures for indexing journals in Pub Med Central may allow publications from predatory journals to leak into Pub Med.
Pub Med, first released in January 1996, ushered in the era of private, free, home- and office-based MEDLINE searching.
Pub Med has been reported to include some articles published in predatory journals.