Funding for this research was provided by:
CAMS Innovation Fund for Medical Sciences (CAMS 2021-I2M-1-004)
Received: 31 October 2021
Accepted: 31 December 2021
First Online: 11 January 2022
: This study was approved by the institutional review board of Shenzhen maternal and Child Health Hospital (No. 164). All methods were performed in accordance with the Declaration of Helsinki. The need for informed consent was waived by the IRB of SZMCHH due to the retrospective nature of archived datasets and fully anonymized personal information.
: All authors consent to the publication of this manuscript.
: The authors declare that they have no conflicts of interest.