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Am J Obstet Gynecol. 1992 Mar;166(3):896-900. doi: 10.1016/0002-9378(92)91358-h.

Diagnosis of cervical change in pregnancy by means of transvaginal ultrasonography.

Joffe GM, Del Valle GO, Izquierdo LA, Gilson GJ, Smith JF, Chatterjee MS, Curet LB

https://doi.org/10.1016/0002-9378(92)91358-h

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