Zhou, Zhenggang
Wang, Jinyu
Fang, Liming
Ma, Jianlin
Guo, Mingbo
Article History
Received: 25 March 2020
Accepted: 8 October 2020
First Online: 12 November 2020
Ethics approval and consent to participate
: Consent to participate was not applicable because data from the SEER were anonymous, and the study was an observational one.
: Not Applicable.
: The authors declare that they have no competing interests.