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Am J Obstet Gynecol. 1986 Mar;154(3):537-46. doi: 10.1016/0002-9378(86)90598-3.
Ultrasound differentiation of the competent from the incompetent cervix: prevention of preterm delivery.
Michaels WH, Montgomery C, Karo J, Temple J, Ager J, Olson J
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