Funding for this research was provided by:
National Natural Science Foundation of China (61772136, 61370210)
Natural Science Foundation of Fujian Province (2019J01060152)
Text and Data Mining valid from 2019-08-13
Received: 22 March 2019
Accepted: 5 July 2019
First Online: 13 August 2019
: The authors declare that they have no competing interests.