Funding for this research was provided by:
Natural Science Foundation of Guangdong Province (2016A030310166, 2014A030313106)
National Natural Science Foundation of China (81700886)
Text and Data Mining valid from 2019-02-25
Received: 27 October 2018
Accepted: 5 February 2019
First Online: 25 February 2019
Compliance with ethical standards
: No conflicts of interest to declare.
: This article does not contain any studies with human participants or animals performed by any of the authors.