Funding for this research was provided by:
Science and Technology Planning Project of Guangdong Province (2014A020212126)
Text and Data Mining valid from 2019-05-27
Received: 18 February 2019
Accepted: 17 May 2019
First Online: 27 May 2019
Ethics approval and consent to participate
: This study was approved by Institutional Review Board, the First Affiliated Hospital, Sun Yat-sen University. All patients provided a written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.