Frequency of uterine contractions in asymptomatic pregnant women with or without a short cervix on transvaginal ultrasound scan.

Berghella V, Iams JD, Newman RB, Macpherson C, Goldenberg RL, Mueller-Heubach E, Caritis SN, Dombrowski MP. Frequency of uterine contractions in asymptomatic pregnant women with or without a short cervix on transvaginal ultrasound scan. Am J Obstet Gynecol. 2004 Oct; 191(4):1253-6.

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