Article History
Received: 28 September 2021
Accepted: 30 November 2021
First Online: 6 January 2022
Declarations
:
: The authors declare that they have no conflict of interest.
: The study was approved by the ethics committee of Hefei Second People's Hospital.
: 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.
: No informed consent was required due to the retrospective nature of the study.