Article History
Received: 20 July 2021
Accepted: 12 September 2021
First Online: 28 September 2021
Declarations
:
: The authors have no conflicts of interest.
: Due to the deidentified nature of data in SEER, the study was exempt from ethics committee approval. The authors are accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. The study conformed to the provisions of the Declaration of Helsinki (as revised in 2013).
: Not applicable.
: Not applicable.