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. 2022 Jun 9;10:895552. doi: 10.3389/fpubh.2022.895552

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Copyright © 2022 Dai, Xu, Wu, Hu, Li, He, Hu and Liao.

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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References' timezone network. The nodes indicate the co-citation references. The size of the nodes reflects the number of citation frequencies. The colors of the node and line represent different years. The X-axis represents the time.