Article History
Received: 30 October 2021
Accepted: 30 May 2022
First Online: 21 June 2022
Declarations
:
: The authors have no conflict of interest to declare.
: Permission was obtained to retrieve SEER data files with the reference number: 12962-Nov2019. Because patient data recorded in the SEER database does not involve any individual identification, therefore, the present study was dispensed with signing informed consent forms and acquiring ethical approval.