Chen, Lei
Sun, Tao
Chen, Shi
Ren, Yanqiao
Yang, Fan
Zheng, Chuansheng http://orcid.org/0000-0002-2435-1417
Funding for this research was provided by:
National Natural Science Foundation of China (81873919)
Article History
Received: 8 February 2020
Accepted: 18 May 2020
First Online: 2 June 2020
Ethics approval and consent to participate
: The research does not need to be reviewed by the ethics committee because the data were from the SEER database, and the written informed consent was exempted. However, the data used in the research was permitted by the SEER database management department.
: All authors approved for publication of the manuscript for the journal.
: The authors declare that they have no competing interests.