Funding for this research was provided by:
National Natural Science Foundation of China (61602435)
Natural Science Foundation of Anhui Province (1708085QF153)
Anhui Provincial Science and Technology Major Project (16030901057)
Text and Data Mining valid from 2019-08-14
Received: 26 February 2019
Accepted: 29 July 2019
First Online: 14 August 2019
Compliance with ethical standards
: Tong Zhou, Xiaofeng Li and He Zhao declare that he has no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.