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[Extract] Key words are the one that people use when searching for articles in literature indexes. They are usually 3 to 10 words or concise phrase that may reveal the main topic of the study and is usually stated along with the abstract. These will help the indexers in cross-indexing the article. A proper keyword will help the paper to be located easily during a literature search, particularly an online search. Choosing a keyword is very important and for that the authors should undersand the subject and purpose of the study. The most important concepts should be selected and then they should be expressed in words. The keywords cannot be picked up simply by the authors. The must appear in the National Library of Medicines List of Medical S...