Funding for this research was provided by:
National Natural Science Foundation of China (31670803, 31500040)
Natural Science Foundation of Liaoning Province (20170540027)
National Key Research and Development Project of China Subject 2 (2017YFD0200902)
Text and Data Mining valid from 2019-10-29
Received: 12 August 2019
Accepted: 16 October 2019
First Online: 29 October 2019
Ethics approval and consent to participate
: Not applicable.
: All authors consent for publication.
: The authors declare that they have no competing interests.