Funding for this research was provided by:
National Natural Science Foundation of China (51502257, 61574122, 21373107, 61704146)
Innovative Research Team (in Science and Technology) in University of Henan Province (13IRTSTHN018)
program for Science & Technology Innovation Talents in Universities of Henan Province (15HASTIT018)
Received: 9 October 2018
Accepted: 16 November 2018
First Online: 3 December 2018
: The authors declare that they have no competing interests.
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