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Authors
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (61803327)
National Natural Science Foundation of China (61703361)
Natural Science Foundation of Hebei Province (F2016203249)
Natural Science Foundation of Hebei Province (E2018203162)
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Article History
Received: 15 April 2019
Accepted: 18 November 2019
First Online: 25 November 2019
Compliance with Ethical Standards
:
: The authors declared that we have no conflicts of interest to this work. We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted.
