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. 2022 Jul 27;9:955237. doi: 10.3389/fcvm.2022.955237

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Copyright © 2022 Xu, Zhao, Xing, Wu and Zhang.

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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The detailed information of country distribution. The terms were represented by nodes, while links (lines) connected the nodes. The size of the circle was proportional to its number of publications, while the width of the line between the two items was related to the magnitude of their collaboration. Items of the same color belonged to the same cluster, indicating that they cooperated closely in this field. The more clusters there were, the more decentralized the cooperation was. The USA, Italy, and England were the top three countries that published the most articles. They were mainly divided into two clusters as shown in this figure. Cluster 1 included the USA, China, England, Canada, and Australia. Cluster 2 included Italy, German, France, Spain, Greece, and Turkey.