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First-trimester screening for chromosomal abnormalities by integrated application of nuchal translucency, nasal bone, tricuspid regurgitation and ductus venosus flow combined with maternal serum free β-hCG and PAPP-A: a 5-year prospective study.
Ultrasound Obstet Gynecol. 2012 May;39(5):528-34. doi: 10.1002/uog.10051.
Ultrasound Obstet Gynecol. 2012.
PMID: 21793085
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