Fu, Liye
Yuan, Hongxia
Cao, Hong
Zhou, Qichang
Tan, Xiaotan
Guo, Jun
Funding for this research was provided by:
the Scientific Research Project of the Hunan Provincial Health and Family Planning Commission (B2017199)
Article History
Received: 24 October 2022
Accepted: 12 December 2023
First Online: 15 December 2023
Declarations
:
: The study was carried out in accordance with the Declaration of Helsinki and approved by the Human Research Ethics Committee of Changsha Maternal and Child Health Hospital (2021001). The need for informed consent was waived for this retrospective study by the Human Research Ethics Committee of Changsha Maternal and Child Health Hospital. All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare no competing interests.