Zhang, Han
Wu, Gang
Ling, Qing
Funding for this research was provided by:
China NSF (61573331)
Anhui NSF (1608085QF130)
Article History
Received: 4 April 2018
Accepted: 3 January 2019
First Online: 18 January 2019
Competing interests
: The authors declare that they have no competing interests.
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