Gao, Guangren
Feng, Lianrong
Fu, Jinguo
Li, Yi
Huo, Zhaoyang
Zhang, Lei
Wang, Lei
Niu, Heping
Kang, Liqing
Zhang, Jun
Article History
Received: 20 July 2021
Accepted: 22 November 2021
First Online: 9 December 2021
Declarations
:
: The present study was approved by the ethical committee of Cangzhou Central Hospital (2020–286-01). The requirement for informed consent was waived by the ethical committee of Cangzhou Central Hospital due to the retrospective nature of the study. Patient data were completely anonymized. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Not applicable.
: The authors declare that they have no competing interests.