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As the world’s leading provider of science and health information, Elsevier serves more than 30 million scientists, students and health and information professionals worldwide.

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PubMed comprises more than 21 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.

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SciVerse Scopus is the world’s largest abstract and citation database of peer-reviewed literature and quality web sources.

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Thomson Reuters Web of KnowledgeSM is a research platform that gives you access to objective content and powerful tools to search, track, measure and collaborate in the sciences, social sciences, arts, and humanities. This intelligent research platform provides access to the world's leading citation databases, including powerful cited reference searching, the Analyze Tool, and over 100 years of comprehensive backfile and citation data.