Geng, Zhiyu http://orcid.org/0000-0002-4568-2944
Bi, Hui
Zhang, Dai
Xiao, Changji
Song, Han
Feng, Ye
Cao, Xinni
Li, Xueying
Article History
Received: 11 April 2021
Accepted: 15 June 2021
First Online: 28 June 2021
Declarations
:
: Not applicable.
: The Ethics Committee of Peking University First Hospital approved the study protocol (Number 2019–173). Written informed consent was obtained from each recruited parturient after providing them with adequate explanations regarding the aims of this study.
: The authors declare that they have no competing interests.