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Am J Obstet Gynecol. 1999 Oct;181(4):809-15. doi: 10.1016/s0002-9378(99)70306-6.
Prediction of preterm delivery with transvaginal ultrasonography of the cervix in patients with high-risk pregnancies: does cerclage prevent prematurity?
Berghella V, Daly SF, Tolosa JE, DiVito MM, Chalmers R, Garg N, Bhullar A, Wapner RJ
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