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Keywords or short phrases can assist indexers to cross-index an article of interest. However, author-defined keywords are not as common or accurate as MeSH (medical subject headings) terms used by researchers in search of bioinformatics [1,2], but authors are often required by their target journal to provide three to ten keywords that represent the main content of the article for an article [3-7]. MeSH terms, developed by the National Library of Medicine (NLM), are manually assigned to each document by biomedical subject specialists based on the context of the whole document [2].
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Tsair Wei Chien (2018) studied this question.
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