Funding for this research was provided by:
Natural Science Foundation of Zhejiang Province (LQ15H160012, LY18H160031, LY19H160004)
Department of Health of Zhejiang Province (2019328882)
Text and Data Mining valid from 2019-11-04
Received: 1 July 2019
Accepted: 9 October 2019
First Online: 4 November 2019
Ethics approval and consent to participate
: The study was a retrospective study with no informed consent from the individual patient, and was approved by the ethics committee of Zhejiang Cancer Hospital.
: This analysis is not applicable because it has a retrospective nature.
: The authors declare that they have no competing interests.