Tang, Xin
Pang, Tong
Yan, Wei-feng
Qian, Wen-lei
Gong, You-ling
Yang, Zhi-gang
Article History
Received: 20 February 2020
Accepted: 30 October 2020
First Online: 11 November 2020
Ethics approval and consent to participate
: Informed consent was waived for this study because patient data from the SEER database were de-identified and openly available.
: Not applicable.
: The authors declare that they have no competing interests.