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

. 2023 Feb 10;14:1098977. doi: 10.3389/fimmu.2023.1098977

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

Copyright © 2023 Huang, Jin, Liu, Lu, Zhang, Yan, Xian, Wang, Zhang, Zhang, Chen, Lu, Yang, Huang, Liu and Ji

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) Co-occurrence network of 50 keywords. Circle size is based on the number of occurrences. Three colors are used to indicate clusters: Blue (cluster1), Red (cluster2), Green (cluster3). (B) Thematic map. All articles were grouped into four clusters, each cluster corresponding to the four themes of the map according to density and centrality. Three keywords with the highest occurrence rate were displayed in each cluster. (C) Trend topics in the 21st century, the graph demonstrates the most frequent keywords over time. The blue dots locate at the year with the highest frequency of occurrences of this keyword.