Huang, Kaiyan
Zhang, Jie
Yu, Yushuai
Lin, Yuxiang
Song, Chuangui
Article History
Received: 30 September 2021
Accepted: 9 March 2022
First Online: 1 April 2022
Declarations
:
: Considering SEER database is publicly available. We signed a <i>Data-Use Agreement for the SEER 1973–2016 Research Data File</i> to get access conditions. Data extraction and usage has been approved by SEER Program. We confirm that all methods were carried out in accordance with relevant guidelines and regulations.
: The manuscript is approved by all authors for publication.
: The authors have declared that no competing interests exist.