Funding for this research was provided by:
National Natural Science Foundation of China (81472209)
Beijing municipal science and technology commission (K2015311201501)
Received: 16 February 2019
Revised: 29 April 2019
Accepted: 15 May 2019
First Online: 25 June 2019
Ethics approval and consent to participate
: The study is approved by the ethical committee of Beijing University of technology committee (approval number IRB-1507).
: Not applicable.
: The authors declare that they have no competing interests.
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