Funding for this research was provided by:
National Natural Science Foundation of China (81802920)
Text and Data Mining valid from 2020-01-31
Received: 18 August 2019
Accepted: 23 January 2020
First Online: 31 January 2020
Ethical approval and consent to participate
: This study was performed in accordance with ethical standards, according to the Declaration of Helsinki, and according to national and international guidelines. The Sun Yat-sen University Cancer Center ethics committee approved the study. All patients provided written informed consent.
: Not applicable.
: The authors read and approved the manuscript, and declare that they have no competing interests.