Funding for this research was provided by:
National Natural Science Foundation of China (11326152)
Natural Science Foundation of Jiangsu Province (BK20130736)
Nanjing Institute of Technology (CKJB201709)
Text and Data Mining valid from 2019-01-16
Received: 6 September 2018
Accepted: 10 January 2019
First Online: 16 January 2019
Ethics approval and consent to participate
: Not applicable.
: The author declares to have no competing interests.