Conclusion
Our findings suggest that pregnant women with a history of HA treatment
of IUAs, especially those with a history of repeat HAs, are at higher
risk of some adverse obstetric outcomes, and thus, close monitoring of
pregnancies of those women is essential to screen for potential
pregnancy complications or adverse birth outcomes and implement early
prevention and intervention.
Author contributions: W.H. contributed acquisition, statistical
analysis and interpretation of the data, and manuscript writing. Z.P.W
contributed to data analysis and manuscript writing. B.Y.W. contributed
to data analysis. L.L. contributed to the conception, design and
supervision of the study. X.C.L. is the guarantor of this study and had
full access to all data and takes responsibility for the integrity of
the data and the accuracy of the data analysis.
Declaration of Interests: The authors declare that there is no
duality of interest associated with this manuscript.
Funding: This study was supported by the Natural Science
Foundation of Shanghai (20ZR1444000).