Zhao, Dacheng
He, Jinwen
Wang, Xingwen
Zhao, Xiaobing
Xia, Yayi
Geng, Bin
Article History
Received: 25 January 2021
Accepted: 10 May 2021
First Online: 24 May 2021
Declarations
:
: This study was conducted in accordance with the ethical guidelines of the Declaration of Helsinki. This retrospective study was approved by the Research Ethics Committee of the Second Hospital of Lanzhou University (2019A-211). Informed consent was obtained from all patients for this study, all patients agreed to participate in the study.
: All patients agreed to have their data published.
: The authors declare that there is no conflict of competing financial and non-financial interests.