Zhao, Chun
Yin, Yi
Zhang, Tianxin
Li, Jing
Zhou, Xiaoming
Wang, Yujuan
Wang, Wei
Wang, Qiwei
Jin, Youpeng
Funding for this research was provided by:
Department of Health of Shandong Province (No. 2016WS0414)
Article History
Received: 13 April 2023
Accepted: 7 August 2023
First Online: 18 August 2023
Declarations
:
: This work has been carried out in accordance with the Declaration of Helsinki of the World Medical Association. The study protocol has been registered in the Chinese Clinical Trial Registration Center (ID: ChiCTR2200056383) and approved by the ethics committee of Shandong provincial Hospital Affiliated to Shandong First Medical University and Qingdao Women and Children Hospital. The need for informed consent was waived by the ethics committee of Shandong provincial Hospital Affiliated to Shandong First Medical University and Qingdao Women and Children Hospital, because of the retrospective nature of the study.
: Not applicable.
: The authors declare no potential conflicts of interest.