Li, Kai
Wu, Guang
Fan, Caibin
Yuan, Hexing
Article History
Received: 23 April 2021
Accepted: 1 July 2021
First Online: 19 July 2021
Declarations
:
: For this study, all data were extracted from SEER database. The institutional review board approval was not required for the SEER program of the National Cancer Institute as it utilizes the deidentified public-use database (ExternalRef removed; ExternalRef removed).
: Not applicable.
: The authors declare that they have no competing interests.