Funding for this research was provided by:
National Natural Science Foundation of China (No.11471015, No.11601003, No.11371027)
University Natural Science Research Project of Anhui Province (KJ2018A0470)
Text and Data Mining valid from 2018-11-09
Received: 6 August 2018
Accepted: 17 October 2018
First Online: 9 November 2018
: The authors declare that they have no competing interests.