Qi, Sangsang
Fu, Xianhu
Article History
Received: 30 April 2023
Accepted: 17 August 2023
First Online: 7 September 2023
Declarations
:
: The Institutional Review Board of Ningbo Women and Children’s Hospital approved this study. The Institutional Review Board of Ningbo Women and Children’s waived the need for informed consent because of the retrospective nature of this study. The research was conducted according to the ethical standard of the Helsinki Declaration, and the patient data were stored anonymously in a dedicated database. All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare no competing interests.