Received: 2 July 2021
Accepted: 30 November 2021
First Online: 14 December 2021
: All procedures performed involving human participants according to the declaration of Helsinki principles. The study was approved by Binzhou Medical University hospital’s ethics committee (Ethics Approval No. 2021-013) and individual consent for this retrospective analysis was waived.
: Not applicable.
: The authors declare that they have no conflict of interest.