Funding for this research was provided by:
National Program on Key Basic Research Project (No.2014CB744401)
General Financial Grant from the China Postdoctoral Science Foundation (No.2016M602971)
Text and Data Mining valid from 2018-05-14
Received: 23 November 2017
Accepted: 26 April 2018
First Online: 14 May 2018
Ethics approval and consent to participate
: Not applicable.
: The authors declare that they have no competing interests.