Wang, Dan
Liu, Chongshun
Zhou, Yuan
Yan, Tingyu
Li, Chenglong
Yang, Qionghui
Xu, Yang
Zhao, Lilan
Pei, Qian
Tan, Fengbo
Güngör, Cenap
Li, Yuqiang
Funding for this research was provided by:
The Nature Scientific Foundation of China (81702956)
Article History
Received: 4 April 2020
Accepted: 4 May 2020
First Online: 13 May 2020
Ethics approval and consent to participate
: This study is based on a retrospective analysis of the SEER database. There is no identifiable patient information in the SEER database, and all data is anonymous. Therefore, written informed consent was not required for this study. The survey was conducted in accordance with the ethical standards of the Helsinki Declaration and national and international norms. This study was approved by the institutional review board of our hospital.
: Not applicable.
: The authors declare that they have no competing interests.