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Authors
Wang, Han
Jiang, Jiqiang https://orcid.org/0000-0003-3198-4631
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (11871302)
Doctoral Scientific Research Foundation of Qufu Normal University and Youth Foundation of Qufu Normal University (BSQD20130140)
a Project of Shandong Province Higher Educational Science and Technology Program (J18KA217)
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Article History
Received: 6 September 2019
Accepted: 5 December 2019
First Online: 2 January 2020
Competing interests
: The authors declare that they have no competing interests.
