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Some thoughts on the true value of ultrasound.
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Absence of nasal bone in fetuses with trisomy 21 at 11-14 weeks of gestation: an observational study.
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Lancet 2001;358:1665-7. -
Lymphatic vessel hypoplasia in fetuses with Turner syndrome.
von Kaisenberg CS, Nicolaides KH, Brand-Saberi B.
Hum Reprod 1999;14:823-6.