Introduction. Preterm birth.
Berghella
Vincenzo
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Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Thomas Jefferson University, Philadelphia, PA 19107, USA.
D002584:Cervix Uteri / Q000502:physiology*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D011247:Pregnancy; D047928:Premature Birth