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. 2019 Aug 9;33(3):104–110. doi: 10.1097/BSD.0000000000000863

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Copyright © 2019 The Author(s). Published by Wolters Kluwer Health, Inc.

This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal. http://creativecommons.org/licenses/by-nc-nd/4.0/

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The analysis of keywords. A, Mapping on keywords of intervertebral disk. The words were classified into 3 clusters according to different colors. The lager the circle, the words were used more frequently. B, Distribution of keywords according to when they appeared for the average time. Keywords with blue color presented earlier than that with yellow. Two terms are said to co-occur if they both occur on the same line in the corpus file. In general, the smaller the distance between 2 terms, the larger the number of co-occurrences of the terms.