参考文献：

[1]Kurman RJ, ed. (1994). Blaustein's Pathology of the Female Genital Tract (4th ed.). New York, NY: Springer New York. pp. 185–201. ISBN 978-1-4757-3889-6.

[2]https://screening.iarc.fr/colpoch/Chapter%252001.pdf

[3]ACOG Practice Bulletin, No. 234: Prediction and prevention of spontaneous preterm birth.Obstet Gynecol 138 (2):e65-e90, 2021

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