Funding for this research was provided by:
major technological innovation project of Hubei Province (2016ACA140)
united fund for innovation and entrepreneurship of Ministry of Education of China (201610512001)
Text and Data Mining valid from 2019-10-15
Received: 4 December 2018
Accepted: 30 September 2019
First Online: 15 October 2019
: The authors declare that they have no conflicts of interest.