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A case-control study of maternal periconceptual and pregnancy recreational drug use and fetal malformation using hair analysis.
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Some thoughts on the true value of ultrasound.
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Ultrasound Obstet Gynecol 2007;30:671-4. -
Screening for fetal abnormalities in multiple pregnancies.
Sebire NJ, Nicolaides KH.
Baillieres Clin Obstet Gynaecol 1998;12:19-36.