PubMed from the United States National Library of Medicine's (NLM) is, with over 27 million citations from Medline and additional sources, one of the largest biomedical databases in the world. PubMed provides references to literature within the field of medicine, nursing, dentistry, veterinary medicine, allied health, and the pre-clinical sciences.
Scopus is an abstract and citation database that covers more than 20,500 titles from more than 5,000 publishers. The subjects covered include scientific, technical, medical and social sciences fields and arts and humanities.
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