Funding for this research was provided by:
National Natural Science Foundation of China (No. 81425018, No. 81672868, No. 81602371)
Text and Data Mining valid from 2019-01-21
Received: 5 December 2018
Accepted: 7 January 2019
First Online: 21 January 2019
Ethics approval and consent to participate
: This retrospective study was approved by the Clinical Research Committee of Sun Yat-sen University Cancer Center. Patients were required to provide written informed consent before enrolling in the study.
: Not applicable.
: The authors declare no competing interests.
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