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Ultrasound screening for anencephaly at 10-14 weeks of gestation.
Johnson SP, Sebire NJ, Snijders RJ, Tunkel S, Nicolaides KH. Johnson SP, et al. Ultrasound Obstet Gynecol. 1997 Jan;9(1):14-6. doi: 10.1046/j.1469-0705.1997.09010014.x. Ultrasound Obstet Gynecol. 1997. PMID: 9060123 Free article.