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. 2022 Jun 16;13:927219. doi: 10.3389/fphar.2022.927219

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Copyright © 2022 Cheng, Guo, Shen, Yang, Wang, Sun and Wu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Network visualization map of keywords co-occurrence analysis. In this network map, keywords with close relationship are assigned to one cluster with the same color. All the keywords could be divided into four clusters: cluster 1 (red nodes), cluster 2 (green nodes), cluster 3 (blue nodes), and cluster 4 (yellow nodes). (B) overlay visualization map of keywords co-occurrence analysis. The node color reflects the corresponding AAY according to the color gradient in the lower right corner. The nodes marked with purple or blue color represent the keywords that appeared relatively earlier, whereas keywords coded with yellow color represents the current research focuses.