Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2022 Aug 11;12:977935. doi: 10.3389/fonc.2022.977935

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Copyright © 2022 Zhang, Leng, Fang, Sun, Li, Kang, Chen and Xu

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.

PMC Copyright notice

(A) Author keywords co-occurrence network with different clusters. (B) Author keywords co-occurrence network with average publication year. (C) Author keywords density map according to the mean frequency of occurrences (yellow indicated the highest frequency). (D) Author keywords thematic map with different clusters (bubble size: the occurrences of cluster keywords) and four domains: Emerging or declining themes; Niche themes; Basic themes; Motor themes. The most common author keywords were used as cluster labels in cluster bubbles.