Funding for this research was provided by:
Science Fund for Creative Research Groups (61421002)
National Natural Science Foundation of China (61501092)
Sichuan Province Science and Technology Support Program (2018066)
Article History
Received: 11 July 2018
Accepted: 14 October 2018
First Online: 24 October 2018
Competing Interests
: The authors declare that they have no competing interests.
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