Pan, Dan
Wang, Mengyao
Liu, Wencheng
Li, Yan
Sang, Lixuan
Chang, Bing
Funding for this research was provided by:
This work was founded by the Shenyang Municipal Public Health Research and Development Special Project in 2020. (20-205-4-094, BC)
Article History
Received: 12 September 2021
Accepted: 26 May 2022
First Online: 9 June 2022
Declarations
:
: Our study complied with the Declaration of Helsinki. All analysis were based on the Surveillance Epidemiology End Results (SEER), a public database and provides de-identified case data, thus no ethical approval is required.
: Not applicable.
: The authors declare that they have no competing interests.