Funding for this research was provided by:
Natural Science Foundation of Guangdong Province (2018A030313863)
Shenzhen Science and Technology Innovation Commission Technical Innovation Project (KQJSCX20180328095506140)
Received: 2 April 2020
Accepted: 18 November 2020
First Online: 1 December 2020
Ethics approval and consent to participate
: The study was approved by the Ethical Committee of Shenzhen University General Hospital. Written informed consent was obtained before the survey commenced.
: All authors have read and agreed to publish the manuscript.
: The authors declare that they have no competing interests.