Received: 10 January 2021
Accepted: 17 June 2021
First Online: 28 June 2021
: The study was carried out in compliance with the declaration of Helsinki. The study was approved by the Institutional Review Board of the First Affiliated Hospital of Zhengzhou University (Number: 2020-KY-417). Because this was a retrospective observational study, and de-identified information was used for the analysis, informed consents were waived as part of the Institutional Review Board of the First Affiliated Hospital of Zhengzhou University approval.
: Not applicable.
: The authors declare there are no conflicts of interest.