COMPLIANCE WITH ETHICAL STANDARDS
Ethical approval: All procedures performed were in accordance with the ethical standards of the institutional research committee and with the 1964 Declaration of Helsinki and its later amendments. The institutional review board of Sun Yet-Sun University Cancer Center approved this retrospective study (approval number: B2020-132-01).
Informed consent: This is a retrospective study based on hospital database. Study associated medical examination or treatment won’t harm patients’ health, so informed consent has been exempted.
Availability of data and materials: The key raw data have been deposited into the Research Data Deposit (http://www.researchdata.org.cn; approval number: RDDA2020001520).
Author contributions: All authors contributed to the final analysis and writing of the manuscript.
Acknowledgments: We are grateful to all doctors and nurses in our department.