Ji, Hui
Zhang, Mian-Qiu
Zhou, Qiao
Zhang, Song
Dong, Li
Li, Xiu-Ling
Zhao, Chun
Ding, Hui
Ling, Xiu-Feng http://orcid.org/0000-0001-7820-9152
Article History
Received: 6 November 2022
Accepted: 22 February 2023
First Online: 4 March 2023
Declarations
:
: This retrospective cohort study was conducted according to the Declaration of Helsinki and approved by the Ethics Committee of Nanjing Maternity and Child Health Care Hospital (2022KY-049). Informed patient consent was not required as the study was retrospective in nature and analyzed patient data anonymously. A statement from the Ethics Committee of Nanjing Maternity and Child Health Care Hospital waived the need for informed consent.
: Not applicable.
: The authors declare no competing interests.