Funding for this research was provided by:
Chongqing Youth Science and Technology Talent Training Project (2016HBRC007)
Text and Data Mining valid from 2020-03-11
Received: 8 October 2019
Accepted: 13 February 2020
First Online: 11 March 2020
Ethics approval and consent to participate
: The Institutional Review Board of the First Affiliated Hospital of Chongqing Medical University approved this study.
: This paper is approved by all authors for publication.
: The authors declare that they have no competing interests.