EndNote X9 was used to remove duplicate articles, and then irrelevant articles were manually filtered. CiteSpace V was used to complete bibliometric analyses of categories, countries and institutions, co-cited journals, authors and co-cited authors, co-occurrence of keywords and references. The parameters of CiteSpace were set as follows: time slicing (from 2009 to 2019, one year per slice); term source (title, abstract, author keywords, keywords plus); node types (select author, institution, country, keyword, category, reference, cited author and cited journal in turn); strength (cosine); scope (within slices); selection criteria (top 50).

The visualization map is mainly composed of many nodes and interwoven connections. Nodes represent different subject categories. The size of each node indicates the number or citation frequency. The larger the circle, the more literature belongs to this research field. Each circle is made up of different color rings, and each color corresponds to the time scale. The change of color from cold blue tone to warm red tone in the time scale indicates the change of time from early to recent. If the periphery of a node is bright red or bright purple, it represents that the node is a burst node or its betweenness centrality is bigger than 0.10. Betweenness centrality measures the degree of one node in the middle of a path that connects to other nodes in the network. The nodes with high centrality are located in the center of the network, which are the transitions of other parts. The line which links two circles indicates that they are connected or cooperated or co-cited. The thickness of a line is proportional to its strength or correlation 27,28.

Note: The content above has been extracted from a research article, so it may not display correctly.



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