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Am J Obstet Gynecol. 2002 Mar;186(3):433-7. doi: 10.1067/mob.2002.120487.

How does early ultrasound scan estimation of gestational age lead to higher rates of preterm birth?

Yang H, Kramer MS, Platt RW, Blondel B, Bréart G, Morin I, Wilkins R, Usher R

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