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. 2022 Apr 5;9:853565. doi: 10.3389/fnut.2022.853565

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Copyright © 2022 Chen, Li, Cao, Qi, Ma, Bai, Zhao, Wu, Liu, Wei, Wang, Jin, Wang and Zhu.

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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Geographic distribution of samples provinces/municipalities. The symbol represents the provinces/municipalities of different COVID-19 pandemic severity. represents the pandemic severity was high. represents the pandemic severity was moderate. represents the pandemic severity was low.

Inline graphic — Geographic distribution of samples provinces/municipalities. The symbol represents the provinces/municipalities of different COVID-19 pandemic severity. represents the pandemic severity was high. represents the pandemic severity was moderate. represents the pandemic severity was low.