Funding for this research was provided by:
National Natural Science Foundation of China (81173376)
Received: 15 March 2019
Accepted: 17 July 2019
First Online: 31 July 2019
Ethics approval and consent to participate
: All procedures in studies involving human participants were performed in accordance with the ethical standards of the institutional review board of Sun Yat-Sen University Cancer Center (2017-FXY-104) basing on the 1964 Helsinki declaration and its later amendments.
: Not applicable.
: The authors declare that they have no competing interests.