Funding for this research was provided by:
National Natural Science Foundation of China (31700767)
Text and Data Mining valid from 2019-12-01
Received: 30 May 2019
Accepted: 10 December 2019
First Online: 24 December 2019
: The authors have no conflicts of any interest relevant to this topic. The corresponding authors had full access to the data and had final responsibility for the decision to submit for publication.