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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.
PubMed Central is a free digital archive of full articles, accessible to anyone from anywhere via a web browser (with varying provisions for reuse). Conversely, although PubMed is a searchable database of biomedical citations and abstracts, the full-text article resides elsewhere (in print or online, free or behind a subscriber paywall).
NCBI distributed the first version of Entrez in 1991, composed of nucleotide sequences from PDB and GenBank, protein sequences from SWISS-PROT, translated GenBank, PIR, PRF, PDB, and associated abstracts and citations from PubMed. Entrez is specially designed to integrate the data from several different sources, databases, and formats into a ...
However, "PubMed Health, a portal for systematic reviews as well as consumer health information, was discontinued on October 31, 2018. The same or similar content is being provided through other NLM resources, namely PubMed and Bookshelf (for systematic review content), and MedlinePlus (for consumer health information)."
Although PubMed is a comprehensive database, many of its indexed journals restrict online access. Another website, PubMed Central , provides free access to full texts. While it is often not the official published version, it is a peer-reviewed manuscript that is substantially the same but lacks minor copy-editing by the publisher.
Website sciencedirect .com ScienceDirect is a searcheable web-based bibliographic database , which provides access to full texts of scientific and medical publications of the Dutch publisher Elsevier as well of several small academic publishers .
BioMed Central was founded in 2000 as part of the Current Science Group (now Science Navigation Group, SNG), a nursery of scientific publishing companies. SNG chairman Vitek Tracz developed the concept for the company after NIH director Harold Varmus's PubMed Central concept for open-access publishing was scaled back. [1]
The location of clinical trial sites being used for a study; and A point of contact for patients interested in enrolling in the trial. The National Library of Medicine in the National Institutes of Health made ClinicalTrials.gov available to the public via the internet on February 29, 2000. [ 6 ]