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 Jun 3;10:918483. doi: 10.3389/fpubh.2022.918483

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

Copyright © 2022 Cheng, Guo, 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.

PMC Copyright notice

(A) The annual publications of the top 3 countries from 2000 to 2021. (B) The international cooperation analysis among different countries. Line thickness between countries reflects the intensity of the closeness. (C) The overlay visualization map of country co-authorship analysis conducted by VOSviewer. Each country is represented as a node, and the node size is proportional to the sum of publications. A link between two nodes indicates a co-authorship relationship. Different nodes were given different colors (based on AAY) according to the color gradient in the lower right corner. (D) The top 10 most frequent funding sources in this field.