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Authors
Zhu, Gaopei http://orcid.org/0000-0002-2085-9336
Zhu, Yuhang http://orcid.org/0000-0002-9236-2812
Wang, Zhongli
Meng, Weijing
Wang, Xiaoxuan
Feng, Jianing
Li, Juan http://orcid.org/0000-0001-8710-4854
Xiao, Yufei
Shi, Fuyan
Wang, Suzhen http://orcid.org/0000-0003-2076-529X
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Funding
Funding for this research was provided by:
The National Natural Science Foundation of China (81872719, 81803337)
The National Bureau of Statistics Foundation Project (2018LY79)
Natural Science Foundation of Shandong Province (ZR2019MH034)
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Article History
Received: 8 July 2020
Accepted: 25 December 2020
First Online: 11 January 2021
Ethics approval and consent to participate
: This was an observational study using national registry data from public platforms. The medical ethics were exempted during the epidemic.
: Not applicable.
: The author declares that he has no competing interests.
