Dai, Yan
Xu, Jin
Han, Xiao-Hui
Cui, Fu-Zhai
Zhang, Dong-Sheng
Huang, Sheng-Yun
Article History
Received: 22 February 2021
Accepted: 21 July 2021
First Online: 10 August 2021
Declarations
:
: This study was approved by the institutional review board of Shandong Provincial Hospital (SWYX: No. 2018-294) and complied with the tenets of the Declaration of Helsinki. Written or verbal informed consent was waived by Shandong Provincial Hospital ethics committee due to the retrospective nature of the study, and all data were analyzed anonymously. No administrative permissions were acquired by the research team to access the data used in our research.
: Not applicable.
: The authors declare that they have no competing interests.