Funding for this research was provided by:
National Natural Science Foundation of China (81902679)
Guangdong Medical Research Foundation (A2018241)
Received: 9 October 2019
Accepted: 23 December 2019
First Online: 6 January 2020
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Sun Yat-sen University Cancer Center (SYSUCC) research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The formal written informed consent was obtained from all individual participants included in the study.
: Not applicable.
: The authors declare that they have no competing interests.