Li, Shijie
Liu, Xuefeng
Chen, Xiaonan
Article History
Received: 22 June 2021
Accepted: 22 November 2021
First Online: 25 November 2021
Declarations
:
: Since SEER is a publicly available database and all records have been deidentified, no additional ethical approval or informed consent was required after the SEER Research Data Agreement was signed for accessing data. The study was carried out in accordance with the Helsinki Declaration.
: Not applicable.
: The authors have declared that no conflicts of interest exist.