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Authors
Feng, Qiang https://orcid.org/0000-0001-6658-9549
Wang, Rong-Bo
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (61861044)
Science Foundation of Yan’an University (YDY2017-05, YDBK2018-36)
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Article History
Received: 12 May 2019
Revised: 16 July 2019
Accepted: 9 September 2019
First Online: 17 September 2019
