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Issues to consider when doing your searching for a systematic literature review:
What’s the difference between pubmed and medline?
In other words, PubMed is one way to access MEDLINE.
Which one should I use?
Personal preference. PubMed is more user-friendly, Web of Science gives you more control over your searches.
MeSH is a controlled vocabulary produced by the National Library of Medicine, Washington, DC.
Controlled vocabulary consists of a restricted subset of possible terms. This allows journal articles to be categorized with a standard set of terms.
For more information visit the National Library of Medicine web site: http://www.nlm.nih.gov/mesh/.