Funding for this research was provided by:
youth innovation fund of the first affliated hospital of zhengzhou university (2019-70885; 2019-70967)
Received: 8 July 2021
Accepted: 27 October 2021
First Online: 13 November 2021
: The authors are accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. The study was conducted in accordance with the Declaration of Helsinki (as revised in 2013). The study was approved by the ethics committee of First Affiliated Hospital of Zhengzhou University and individual consent for this retrospective analysis was waived.
: The consent for publication in this retrospective study was not applicable.
: The authors have no conflicts of interest to declare.