First-trimester ductus venosus Doppler velocimetry for estimation of risk of Down syndrome

DOPPLERVELOCIMETRIA DO DUTO VENOSO NO CÁLCULO DE RISCO PARA SÍNDROME DE DOWN NO PRIMEIRO TRIMESTRE DA GRAVIDEZ

Carlos Geraldo Viana Murta, Márcio Augusto Pinto de Ávila, Antônio Fernandes Moron

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