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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.
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.
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).
The service is funded by the NLM and is free to users. MedlinePlus provides encyclopedic information on health and drug issues, and provides a directory of medical services. MedlinePlus Connect links patients or providers in electronic health record (EHR) systems to related MedlinePlus information on conditions or medications.
The terms "free", "subscription", and "free & subscription" will refer to the availability of the website as well as the journal articles used. Furthermore, some programs are only partly free (for example, accessing abstracts or a small number of items), whereas complete access is prohibited (login or institutional subscription required).
PubMed: biomedical literature citations and abstracts, including Medline—articles from (mainly medical) journals, often including abstracts. Links to PubMed Central and other full-text resources are provided for articles from the 1990s. PubMed Central: free, full-text journal articles; Site Search: NCBI web and FTP web sites; Books: online books
Medscape is a website providing access to medical information for clinicians and medical scientists; the organization also provides continuing education for physicians and other health professionals. It references medical journal articles, Continuing Medical Education (CME), a version of the National Library of Medicine 's MEDLINE database ...
Early in the history of Index Medicus, quality was determined by manually sifting through publications and choosing what subjectively seemed good, but later the Editor of Index Medicus convened a committee of world experts to identify the world's best medical journals and then have citations for articles from those journals made accessible.