Funding for this research was provided by:
National Natural Science Foundation of China (31430082)
National Key Basic Research Program of China (2013CB127300)
Text and Data Mining valid from 2019-11-07
Received: 4 June 2019
Revised: 21 September 2019
Accepted: 28 September 2019
First Online: 7 November 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.