Song, Shijing
Wang, Jingjing
Wang, Li
Hou, Chenxiao
Wu, Qingqing
Article History
Received: 7 December 2022
Accepted: 11 April 2023
First Online: 23 May 2023
Declarations
:
: This study was approved by the Institutional Review Boards/Ethics Committees of Beijing Obstetrics and Gynecology Hospital (2019-KY-106–01). All pregnant women and their legal guardians were informed in detail and signed informed consent to voluntarily participate in this study. All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare no competing interests.