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. 2023 May 30;13:1196967. doi: 10.3389/fcimb.2023.1196967

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Copyright © 2023 Wang, Dong, Zheng, Mai, Ding, Pan, Tang, Wan and Liang

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) Heat map of keywords themselves and (B) time-related heat map of keywords. Sections discrete with colors or blocks mean clusters of keywords. Top 100 keywords are counted.