Funding for this research was provided by:
National Natural Science Foundation of China (82001858)
Youth Talent Science and Technology Project of Changzhou Health Commission (QN201921)
the Key Laboratory of Changzhou High-tech Research Project (CM20193010)
Youth Talent Development Plan of Changzhou Health Commission (CZQM2020053)
Received: 3 October 2020
Accepted: 8 December 2020
First Online: 5 January 2021
Ethics approval and consent to participate
: We received permission from the National Cancer Institute, US to access the research data file in the SEER program (reference number 13610-Nov2019). Ethics approval was not applicable because SEER data is publicly available and without specific identifiers.
: Not applicable.
: The authors have no conflict of interest.