Funding for this research was provided by:
Chongqing Medical University (LTMCMTS201901)
Text and Data Mining valid from 2019-12-01
Received: 6 September 2019
Accepted: 22 November 2019
First Online: 3 December 2019
Ethics approval and consent to participate
: The study’s protocol and data collection procedure were approved by Chongqing Medical University (Reference Number 2018021).
: Not applicable.
: The authors declare that they have no competing interests.