Guo, Xingdan
Lin, Chunhua
Zhao, Jing
Tang, Mi
Article History
Received: 26 September 2022
Accepted: 12 December 2022
First Online: 20 December 2022
Declarations
:
: The study protocol was approved by the Ethics Committee of the Hunan Provincial Maternal and Child Health Care Hospital, Changsha, China (No. 2022-S014). The need for written informed consent was waived by the ethics committee of Hunan Provincial Maternal and Child Health Care Hospital because of the retrospective nature of the study. All experiments were performed in accordance with the Helsinki Declaration.
: Not applicable.
: The authors declare that they have no competing interests.