Funding for this research was provided by:
National Natural Science Foundation of China (61201381, 61401513, 61772548)
China Postdoctoral Science Foundation (2016M592989)
Self-Topic Foundation of Information Engineering University (2016600701)
Outstanding Youth Foundation of Information Engineering University (2016603201)
Article History
Received: 4 September 2017
Accepted: 28 May 2018
First Online: 19 June 2018
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: Informed consent was obtained from all authors included in the study.
: The authors declare that they have no competing interests.
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