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. 2021 Sep 28;9:720953. doi: 10.3389/fpubh.2021.720953

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Copyright © 2021 Yu, Rui, Cheng, Zhao, Liu, Lin, Zhu, Wang, Xu, Yang, Liu, Wang, Lei, Zhao, Zhao, Zhang and Chen.

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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Punctuation map of incidence in our study areas (2008–2018). (A) Jilin Province (in the north of China). (B) Jiangsu Province (in the east of China). (C) Xiamen City (in the south of China). (D) Chuxiong Yi Autonomous Prefecture (in the southwest of China). The map depicted in this figure was taken from Wikimedia Commons (http://commons.wikimedia.org/wiki/Main_Page).