Bi, Jun
Wang, Yongxing
Zhang, Jiawei
Funding for this research was provided by:
Fundamental Research Funds for the Central Universities (2018YJS093)
National Natural Science Foundation of China (71621001)
Key research and development project of Shandong Province (2016GGX105004)
Article History
Received: 3 January 2018
Accepted: 11 October 2018
First Online: 24 October 2018
Competing interests
: The authors declare that they have no competing interests.
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