Funding for this research was provided by:
National Natural Science Foundation of China (81771908, 81571750)
Received: 11 April 2019
Accepted: 8 August 2019
First Online: 16 August 2019
Ethics approval and consent to participate
: This study conforms to the ethical guidelines for human research and the Health Insurance Portability and Accountability Act. The study protocol was approved by the First Affiliated Hospital of Sun Yat-Sen University and the Cancer Center of Sun Yat-Sen University. The need for informed patient consent was waived and there is no publication of identifying information or images in the manuscript.
: Not applicable.
: The authors declare that they have no competing interests.