Funding for this research was provided by:
Scientific Research Project of Beijing Union University: Opening Project of Key Laboratory (NO.LDSP201801)
Text and Data Mining valid from 2019-10-28
Received: 5 June 2019
Accepted: 16 October 2019
First Online: 28 October 2019
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.