Funding for this research was provided by:
Natural Science Foundation of Guangdong Province (2015A030313729)
Guangzhou Science Technology and Innovation Commission (201804010073)
Text and Data Mining valid from 2019-11-30
Received: 30 May 2019
Accepted: 6 November 2019
First Online: 30 November 2019
Ethics approval and consent to participate
: The study was approved by the Guangzhou First People’s Hospital ethics committee. All participants were informed of the study and signed a consent form to participate.
: Written informed consent for publication was obtained.
: The authors declare that they have no competing interests.