Funding for this research was provided by:
National Natural Science Foundation of China (81703060)
Guangdong Medical Research Foundation (A2016286)
National Natural Science Foundation of China (81802441)
Received: 8 May 2018
Accepted: 10 July 2019
First Online: 7 October 2019
Ethics approval and consent to participate
: The study was approved by the ethics committee of Sun Yat-Sen University Cancer Center (No. GZR2011–10). All subjects were aware of the study protocol and gave written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.