Chen, Huihui
Wang, Wenjing
Wang, Husheng
Wang, Xipeng
Article History
Received: 5 September 2021
Accepted: 24 February 2022
First Online: 8 March 2022
Declarations
:
: This retrospective study was approved by the Ethics Committee of the Shanghai First Maternity & Infant Hospital (KS1512). All patients provided written informed consent. We confirm that all methods were performed in accordance with the relevant guidelines and regulations.
: Consent for publication was obtained from all persons.
: The authors declare that they have no conflicts of interest and nothing to disclose.