Funding for this research was provided by:
National Natural Science Foundation of China (81602941, 81573257)
Natural Science Foundation of Fujian Province (2016J01408)
Text and Data Mining valid from 2019-12-01
Received: 24 June 2018
Accepted: 29 November 2019
First Online: 10 December 2019
Ethics approval and consent to participate
: The dataset used in this study is a publicly available dataset. Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.