Zheng, Wenwen
Zhu, Weiwei
Yu, Shengqiang
Li, Kangqi
Ding, Yuexia
Wu, Qingna
Tang, Qiling
Zhao, Quan
Lu, Congxiao
Guo, Chenyu http://orcid.org/0000-0001-5677-6762
Funding for this research was provided by:
Yantai Science and Technology Bureau (2020YD014)
Article History
Received: 27 April 2020
Accepted: 29 October 2020
First Online: 4 November 2020
Ethics approval and consent to participate
: Our study was exempted from institutional review board approval because of using the de-identified data in the SEER database.
: Not applicable.
: The authors declared that they had no competing interests.