Wang, Yu
Pang, Zhaofei
Chen, Xiaowei
Yan, Tao
Liu, Jichang
Du, Jiajun
Funding for this research was provided by:
National Natural Science Foundation of China (81672288)
Shandong Province Key R & D Plan (2018GSF118028)
Article History
Received: 26 December 2019
Accepted: 9 June 2020
First Online: 15 June 2020
Ethics approval and consent to participate
: Because the patients in the SEER database could not be identified, the analysis and reporting of the data in our study were exempt from review by the Ethics Board of Shandong Provincial Hospital Affiliated to Shandong University, Shandong Provincial Hospital Affiliated to Shandong First Medical University. The requirement for written informed consent to participate was waived. We were permitted to have Internet access to the database after our signed data-use agreement (ExternalRef removed) was approved by the SEER administration. All patients from Shandong Provincial Hospital read and signed the informed consent for surgery. The ethical committee and institutional review board of Shandong Provincial Hospital approved this study.
: This manuscript is approved by all authors for publication.
: The authors declare that they have no competing interests.