Declarations
Ethics approval and consent to participate This study was
approved by the ethics committee of Obstetrics and Gynecology Hospital
of Fudan University (No. Kyy-2020-162). Oral informed consent was
obtained from the parents of the infants for using the images and data
for analysis.
Consent for publication Not applicable.
Availability of data and materials: All data generated or
analysed during this study are included in this published article [and
its supplementary information files].
Competing interests There is no conflict of interest associated
with this manuscript.
Funding This research was funded by financial support from the
Shanghai Municipal Health Commission(202040402), Shanghai, China.
Author Contributions JM.W and GN.X proposed the idea of this
research and designed the protocol. GN.X performed the LUS. JL.D and
XF.W collected clinical data. Y.Y performed the statistics analysis.
GN.X and JM.W drafted the article and revising it critically for
important intellectual content. F.L, Y.Y, CQ.L, XF.W have been involved
in revising the manuscript critically for important intellectual
content. All authors read and approved the final manuscript.
Acknowledgement Baoyunlei and Yinjun, the secretaries of our
department, must be appreciated because of great efforts to this study