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Obstet Gynecol. 1986 Sep;68(3):434-5. doi: 10.1097/00006250-198609000-00031.
Cervical dilatation and prematurity revisited.
Leveno KJ, Cox K, Roark ML
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Obstet Gynecol. 1986 Sep;68(3):434-5. doi: 10.1097/00006250-198609000-00031.
Leveno KJ, Cox K, Roark ML