Shao, Qiang
Wang, Dong
Ge, Ping-shu
Wang, Le
Funding for this research was provided by:
Fundamental Research Funds for the Central Universities (DC201502010305)
Liaoning Provincial Natural Science Foundation of China (201602196)
Article History
Received: 9 March 2018
Accepted: 30 May 2018
First Online: 11 June 2018
Competing interests
: The authors declare that they have no competing interests.
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