Funding for this research was provided by:
Sciencecand Technology Planning Project of Guangdong Province, China (2013B022000040)
Received: 30 March 2019
Accepted: 26 August 2019
First Online: 18 September 2019
Ethics approval and consent to participate
: The study was approved by the ethics committee of Sun Yat-sen University Cancer Center (Ethical approval number: YB2016–070).
: Not applicable.
: The authors declare that they have no competing interests.