Zi, Hao
Gao, Lei
Yu, Zhaohua
Wang, Chaoyang
Ren, Xuequn
Lyu, Jun
Li, Xiaodong http://orcid.org/0000-0002-0002-6230
Article History
Received: 2 August 2019
Accepted: 4 October 2019
First Online: 14 October 2019
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: Not applicable.
: Since all of the information in the SEER database has been de-identified, no institutional review board approval or informed consent was required for this study.
: All authors listed approved the publication of the manuscript.