Funding for this research was provided by:
National Natural Science Foundation of China (31730004, 21575089)
Text and Data Mining valid from 2019-04-17
Received: 22 January 2019
Revised: 31 March 2019
Accepted: 1 April 2019
First Online: 17 April 2019
Compliance with ethical standards
: This article does not contain any studies with human participants or animals performed by any of the authors.
: The authors declare that they have no conflict of interest.