Funding for this research was provided by:
China Scholarship Council
Text and Data Mining valid from 2018-08-11
Received: 19 April 2018
Revised: 5 August 2018
Accepted: 6 August 2018
First Online: 11 August 2018
Compliance with ethical standards
: The authors declare no conflict of interest.
: All applicable international, national and/or institutional guidelines for the care and use of animals were followed. This article does not contain any studies with human participants performed by any of the authors.