Funding for this research was provided by:
Natural Science Foundation of Guangdong Province (2016A030310398)
Text and Data Mining valid from 2019-09-03
Received: 22 May 2019
Accepted: 22 August 2019
First Online: 3 September 2019
Ethics approval and consent to participate
: This study was approved by the Regional Ethics Committee of Nanfang Hospital.
: Not applicable.
: The authors declare that they have no competing interests.