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Authors
Zhang, Lulu https://orcid.org/0000-0001-7209-5879
Shen, Lina
Ju, Zejia
Fu, Yu
Qin, Shan
Cui, Jiansheng
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Funding
Funding for this research was provided by:
Natural Science Foundation of Hebei Province (D2019208152)
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Article History
Accepted: 29 October 2020
First Online: 16 November 2020
Compliance with ethical standards
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: LZ and JC have received research grants from Natural Science Foundation of Hebei Province. LS, SQ, ZJ, and YF collected and analyzed the data for the references. LZ, LS, ZJ, YF, SQ, and JC declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors. All of the authors obeyed the compliance with ethical standards.
