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. 2021 Jul 21;12:670220. doi: 10.3389/fneur.2021.670220

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Copyright © 2021 Du, Yang, Wang, Wang, Liang, Zhu, Sun and Cai.

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) The co-citation network visualization map of keywords based on VOSviewer; (B) The density visualization map of keywords based on VOSviewer; (C) The cluster visualization map of keywords based on VOSviewer; (D) The top 25 keywords with the strongest citation bursts based on CiteSpace, The red horizontal stripes represent the years with the most frequent keyword use. The green horizontal stripes represent the years with the most infrequent keyword use.