The ultrasonic changes in the maturing placenta and their relation to fetal pulmonic maturity

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Correlation of real-time ultrasonic placental grading with amniotic fluid lecithin/sphingomyelin ratio

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The correlation of ultrasonic placental grading and fetal pulmonary maturation in five hundred sixty-three pregnancies

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Real-time ultrasound of the placenta in assessment of fetal pulmonic maturity

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Placental Grade and Pulmonary Maturity in Premature Fetuses

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