Funding for this research was provided by:
Shanghai Municipal Key Clinical Specialty (shslczdzk01102)
Ministry of Science and Technology of the People‘s Republic of China under Grant : National Key Project of ‘13th five-year’ Infectious Diseases Program (2017ZX10202101)
Fudan University under Grant (RC-QT-2019-01)
Received: 11 October 2019
Accepted: 30 October 2020
First Online: 13 November 2020
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 13114-Nov2018). Ethics approval was not applicable because SEER data is publicly available and without specific identifiers.
: Not applicable.
: The authors declare that they have no competing interests.