Fan, Dazhi http://orcid.org/0000-0003-2773-9166
Zhang, Huishan
Rao, Jiaming
Lin, Dongxin
Wu, Shuzhen
Li, Pengsheng
Chen, Gengdong
Zhou, Zixing
Liu, Juan
Chen, Ting
Chen, Fengying
Guo, Xiaoling
Liu, Zhengping
Article History
Received: 22 December 2020
Accepted: 3 June 2021
First Online: 24 June 2021
Declarations
:
: An institutional review board-approved (FSFY-MEC-2019-044) retrospective cohort study performed at Affiliated Foshan Maternity & Child Healthcare Hospital, Southern Medical University. As all cases were routinely and retrospectively collected and datasets were fully anonymized prior to analysis, and the data collection was registered with the audit department, informed consent, written or verbal, from all participants approval were not required. The Academic Board of the Hospital approved to our team to access the data used in our research.
: Not applicable.
: The authors declare that they have no competing interests.