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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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Detailed information of organization distribution. The size of the circle represented its number of publications. Harvard Medical School had published the highest number of research publications in this field followed by the Columbia University and Mayo Clinic. Various institutions cooperated with each other, however, mutual exchanges and cooperation were relatively limited. Harvard Medical School, Columbia University, and Stanford University cooperated with each other most frequently. Huazhong University of Science and Technology, King's College London, and Wuhan University cooperated more frequently.