Li, Qing
Liang, Aihua
Liu, Hongzhe
Funding for this research was provided by:
National Natural Science Foundation of China (61502036)
the General Project of Scientific Research Project of the Beijing Education Committee (KM201611417015)
Open Funding of Beijing Key Laboratory of Information Service Engineering (Zk20201502)
Article History
Received: 13 June 2017
Accepted: 8 February 2018
First Online: 1 March 2018
Competing interests
: The authors declare that they have no competing interests.
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