Funding for this research was provided by:
China Scholarship Council (2015BSZ778, 2017BSZ011594)
Postdoctoral Research Foundation of China (2016M600264, LBH - Z16253)
Text and Data Mining valid from 2018-11-09
Received: 14 May 2018
Accepted: 9 October 2018
First Online: 9 November 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human or animal subject performed by any of the authors.
: Not applicable.