Zhai, Xiaoqian
Liu, Jiewei
Lu, Donghao
Zhou, Qinghua
Article History
Received: 20 September 2021
Accepted: 19 December 2021
First Online: 1 February 2022
Declarations
:
: Because the SEER dataset is public, informed patient consent was not required. Therefore, this study has been granted an exemption from requiring ethics approval form institutional Review Board of West China Hospital, Sichuan University.
: Not applicable.
: All authors declare that they have no competing interests.