Funding for this research was provided by:
National Natural Science Foundation of China (61701155)
Text and Data Mining valid from 2019-08-27
Received: 30 January 2019
Accepted: 22 July 2019
First Online: 27 August 2019
Ethics approval and consent to participate
: This article does not contain any studies with animals or humans performed by any of the authors.
: The authors declare that they have no competing interests.