Article History
Received: 7 December 2022
Accepted: 7 August 2023
First Online: 16 August 2023
Declarations
:
: The study design was approved by the appropriate ethics review board and the need for informed consent was waived. We have read and understood your journal’s policies, and we believe that neither the manuscript nor the study violates any of these.
: According to the regulations of the Biomedical Research Ethical Committee of Shandong Provincial Hospital, the retrospective studies can exempt informed consent.
: The authors declare no competing interests.